I just found out my 16 yr old daughter is pregnant..?

I just found out yesterday my 16 yr old daughter is pregnant. Everyone is so disappointed with her, she was told often about the consequences of having and she still messed up. I actually had an appointment next week to get her on birth control : ( Anywho, what I'm really having issues is with the father. He's 17, high school dropout, has another kid in another country and not supporting the child. According to my daughter she said his parents took him out of school for some reason like they were afraid he was going to get hurt, so I have no clue what that's all about. She wants nothing to do with him, because she says he is a loser. So why sleep with him, right? This sounds harsh but god, teenagers can really be stupid. Well the boy says that they are going to be together whether she likes it or not. He sounds pretty aggressive and I'm fearful for my daughter and my grandbaby. Should we just let him go and not pursue child support or should we try to involve him in their life?