Which age group are we talking? I ask because there is sort of a stigma with having kids young. If the people in question had kids at a young age, they may feel your position is a personal attack against them. They could also believe you're attacking their children because of behavior problems. It's the same with anything that can be viewed in a negative light. Hell, people seem to get offended when I tell them I don't drink alcohol and never have, but nobody will get offended if you say "I don't like onions" because there's no stigma associated with it. It's the same with the LGBLTs; if you even question anything about the gay community, people think you're attacking them. For some reason, many people automatically think others have malicious intentions, and maybe that's just indicative of their own insecurities.