But life is not only suffering, there are good parts in life too

Not if you are a farm animal.
Life is suffering from birth to death to most of the creatures in the world. People who state that kind of declaration are obviously speciesists and anthropocentric. If they were analyzing life from all earth’s creatures’ point of view, they would never have stated such a claim.

Imagine a situation in which over 90% of the people in the world are crippled who suffer from constant pain for about half of their life time.
A global nightmare!
Our real world is much worse than the one you have just imagined.
This is an every day reality for a population which is 8 times larger than the human one, annually!
This is the reality of 90% of the chickens raised for meat.

If you object the idea because life has its good parts too, we ask you to observe things from the point of view of one spermatozoon. What are the chances of the newborn baby to be happy?
Most humans think about life and about happiness from a human perspective only.
Well the chances of the one spermatozoon to be a happy human are not so good.
There is a 50% chance it will be a woman. Of course it doesn’t mean she can’t be happy, but it means she will be automatically and systematically discriminated against for her entire life just because of her gender. There is a 25% chance that a female will experience some sort of sexual abuse.
It has 12% chance to be white. 6% chance to be a white male. And less than 3% chance to be a white male in a western country.
It has more than 50% chances to be very poor.
The spermatozoon has a 20% chance to live with lack of safe drinking water and 30% chance to live without water for basic hygiene. 18% chance it will suffer from hunger. 25% chance it will live in dangerous, unstable situations. 20% chance it will be illiterate. 30% chance it will be in a constant risk of getting malaria. 40% chance it will be at risk from dengue.
The list never really ends. There are so many suffering causes and that is when the spermatozoon turned to be the best protected animal – human. Things get significantly worse when we calculate the spermatozoon chances to be happy if it turns to be ANY creature in the world.
The spermatozoon’s chances to become a farm animal are more than 720 times the chances it will become a human.

Suffering is an inherent part of life. Choosing life is choosing suffering. The math is very simple. Most of the creatures suffer most of the time. A non-speciesist perspective, a point of view that doesn’t favor the interests of one species over another, necessarily leads to the conclusion that this world has to be stopped. Considering the amounts of suffering in the world, it has to be done as soon as possible and by all means.

What kind of a world do you prefer?
A world in which there is not even one suffering creature (not to mention hundreds of billions), and a much lower number of creatures that life and pleasure were prevented from them but they are not aware of that because they were never even born (it is not as if they are sitting somewhere frustrated, pity themselves over what they have missed. They were never born, therefore don’t know what was deprived of them, good or bad).
Or a world in which billions of creatures are daily tortured in order that a much smaller amount of creatures will be able to live comfortably, procreate and enjoy themselves?

The mechanism of life is rotten from its roots. No argument will make it prettier.