actually now that i think about it..i retract what i said...for those beasts, they can procreate, but cannot keep the kids..have to give it up for adoption.
This, I agree with. It is a mitzvah to have children...
it depends by what you mean by murderer...Look at Yigal Amir..Is he a murderer that deserves to have children? I think so...But Charles Manson or some evil beast? No...
Yigal Amir is not a murderer...
To us he isn't..but to others he is...So if we were to lay down the law that murderers could not have kids, then what if, Gd forbid, the other side ruled and forbade a hero that they considered a murderer to not be allowed to have kids? If you notice, Torah rules take these things into consideration and it's fascinating how the Rabbis back in the day think.
So I will go with that murderers should be allowed to make kids, but should not be allowed to keep them and have to give them away for adoption...