All of my friends think Im insane for wanting another baby, what are your thoughts?

Me and my husband had a vasectomy 11 years ago after both of our children were born severly disabled, now after 8 years of gentic testing we found out it wasnt us and he is scheduled for a reversal in September. All of my friends think Im trying to relive time I was robbed of with my first two, but the more I tell them that isnt it at all, the more they heckle me about just *getting my freedom back* and starting all over. I have always had a need to have more children and was against the vasectomy in the first place but because of the doctors urging us about our childrens illnesses being genetic (possibly) I couldnt watch another child go threw that. Any thoughts?