Difficult questions Gosia...
And hard to "solve" with the logical mind...
Feel like reading a long post? If not...stop asking difficult questions

So to even attempt to answer this type of question for yourself you first have to ask yourself some basic and even "difficult" questions. What do you believe in? A creator? The universe as a completely chaotic random event? "God" in some way shape or form exists or no?
To those who do not believe in a creator of some sort I'd suggest the question itself becomes irrelevant (and I've heard the question asked many times in various ways by people who profess no belief in any type of creation at all)...and indeed to many the very fact that suffering exists is grasped at as "proof" that a creator could not or does not exist.
There are many theories but no proofs that I can see...(and within that I believe the answer perhaps lays).
Different philosophies have different answers. Some believe purely in karma...the never ending cycle of birth and rebirth that can be for each individual at best a forward progression...at worst a regression...then there are variations on the karmic cycle with a few escape hatches thrown in.
Some karmic belief systems reckon each individual made specific next (this) life decisions to either evolve or pay back some kinda debt or even reincarnate to help humanity as a whole. Some see karma as an inescapable (without intervention) noose and others see it as the total responsibilty of each individual soul to work through on their own no matter how many milleniums it takes.
If you look closely you will see an underlying similarity in many belief systems ( a few different versions of it though). The similarity is that human suffering is man made and the creator (a) Knew this would happen ahead of time but it is indeed a necessary part of the evolution of a created being who has been given free will...or (b) Didn't know this would happen 'cause after all there's been a stack of successful experiments in the universe and this one's just gone belly-up, but either they (we) sort it out pretty soon or it's gonna have to be sorted for them (us).
There a whole bunch of twists and turns to the above but that'll do for an intro.
The Christian belief system (or should I say multiple systems) can be summed up the same way. Old Testament= stuck in the Karmic wheel...we are all inherently evil (except for the good bits) and needed some intervention (sacrifice of Gods supposedly only etc etc) to cover up the evil (break the karmic cycle)...entry fee varies depending on which "brand" of "modern christianity" one subscribes too.
So we end up with three basic belief systems with dozens (at least) of interpretations and variations:
1) A creator does not exist and everything is a random event including life on Earth. If that's the case I'm off to the pub-club-(fill in whatever "x" turns your hedonist crank) because ultimately I have no responsibility for anything including my own words and actions and I wish this annoying conscience-thingy would rack-off.
2) The creator(s) whoever he-she-they-it be created the universe much like a garden and only the "good fruit" is going to be harvested and the rest discarded. Being designated a "good fruit" varies greatly depending on which (now religous) beleif system you are born into, choose to adopt or choose to be brainwashed by.
3) Every created being is eternal and immortal...and is indeed going through their own personal evolution to fully grasp what free will is all about...and on top of that it seems there's a global-race conciousness as well.
The further down the path of believing in and accepting that we are indeed created beings (and if you don't personally believe that then stop reading now, you'll gain nothing from reading this) the more you begin to question the "negative" sides of life in a way that genuinely wants an answer rather than in a way that many do, which does not sincerely seek an answer, but is it's own answer...
Part of the real question here...and indeed part of the answer...is what is our
individual level of responsibilty.
None of these questions can be answered with the mind...the mind may ask them..but the mind cannot answer them if the mind receives an answer from the heart... it cannot decipher it.
But If the heart asks the question...
What part of us is it that rebels against the suffering in the world....and what part of us is it that causes it?
Why do we see ourselves so detached from it that we have to appoint blame to another...whether that other be
our fellow man or
our creator.
The real answer to these questions lies in
each individuals inner core.
Seeking perfection...can only occur in an environment where perfection either does not or cannot exist or is extremely rare.
Trust and faith and true understanding live in the heart and soul.
You trust that each day the sun will rise... (it's been doing it quite a while now without too many apparent technical difficulties)...you trust in the ebb and flow...yet what you are actually questioning here in one sense is the
dark side of your own nature.
We all have it.
We are all interconnected.
Nuff fer now.
John