YANBU.
There are some wonderfully judgy and holier than thou attitudes on this thread, if these are a typical snapshot of RL then it's not surprising (though it is disappointing) that people get asked this stuff.
Just to clear up a misconception: you CAN'T always spot a potential abuser. It's lovely and reassuring to think you would definitely be able to, but it isn't possible. Maybe in a few cases but not most.
When I met my Ex, he was mid-30s, skilled tradesman with a stable occupation, good group of friends (who in the main had long term partners). He only drank socially, didn't smoke, had never done drugs. He was generous and kind - always paid for drinks/food when we went out, bought a present for my friend who babysat my DS when we went out.
Apart from one brief row where he made me cry 4 months into our relationship (not long after I found out I was pregnant), everything was fine, and we were very happy.
It wasn't until we bought a house together over a year later that he showed his true colours. Within a week of moving in, he smashed up all my pictures, and punched a hole through the (glass) door. It escalated from there to emotional and physical abuse.
I honestly don't think it was possible to see it coming, certainly not prior to my pregnancy. He has to my certain knowledge, never abused a previous partner, or the gfs he's had since me. My bad luck, I guess.
The only thing I can say is that although I always wanted a 3rd child, I wouldn't/couldn't have one with him. I didn't want to be any more tied to him than I already was, or make it any more difficult for myself to leave him. I suppose though that if you still had the hope someone would change, you might want to give them the benefit of the doubt and have another baby. I never believed my Ex change though.