Need some advice and to vent...

I just need an objective perspective and feel safe to vent because you all don't know the people I am venting about. My bf and I have been living in a roommate situation since before we conceived. Tbh our pregnancy was unplanned but not unwanted. This baby is a blessing and we couldn't be happier. Our roommates (married couple) have been trying to conceive for years. The problem is they both have a bad drinking problem. They drink in excess over 4 days a week until daylight. The wife is 38 and when she was 23 had a son and he was taken away by cps. Since, she has had 4 abortions. I asked if she was worried about the risk of Down's syndrome because of her age (because I have had anxiety about my baby's Heath, I'm 31) and her response was that if she had a baby with birth defects she would give it up for adoption. I can't imagine not being able to give my love to a child because of a birth defect or disability. I am just horrified at the thought of them conceiving. I am just so torn with guilt because I feel like I'm being so judgmental. They just started fertility treatments and I'm secretly hoping they don't conceive. Am I being hormonal? Am I an awful person for wishing they don't have children? How do I let go of these negative feelings toward them? Please be gentle, I'm being extremely honest