I think having children in general is selfish, it doesn't matter if you have diabetes or not. You're having a baby for yourself, not for someone else. Of course, the risk of heredity is much higher than in people without diabetes, but it's up to you to have children or not. If your child inherits t2, will you blame yourself, will you be able to live with it? Would you blame your parent if you inherited diabetes yourself? I think the answer will be very different for different people.
Well, pregnancy in any case is dangerous even for healthy people, but modern medicine can significantly reduce the risk of complications if you plan it and visit a doctor on time.
I think you need to answer the question do you want a child badly enough to accept all these risks, will you love him even if everything goes according to the worst scenario, will you be able to help him become happy no matter what?