"humans should be able to decide individually on their own."
Nobody should decide If someone persone should live or not.
"For example if that person has own problems, too young to take responsibility, no money, no way to provide a good and safe environment for the child etc"
Put it into an orphanage, If you were dumb enough to get her pregnant in the first place then this is the least you can do, killing is killing,
"Or if rape happened, it would be very inhuman to force people to take care of a child they would get that way and have psychological problems because of it"
Same thing, put it into an orphanage, do you know what is more inhuman than raising rapists child? Killing it, if you can't look at it that doesn't matter someone else can't, innocent baby does not deserve to die bcz of the unfortunate accident.