I suppose that's the sort of thinking behind many of the seemingly poor choices that people make and the mainstay of vices like smoking, alcohol consumption, coffee, drugs and other vices, especially physically addictive ones. "I know it's wrong but I like it so I'm going to do it anyway even if it kills me or others". I think there are always going to be people who are not going to change. Fortunately there are many that do eventually realise the absurdity of their behaviours and are willing to change, however it is currently much easier to carry on doing what the majority are doing and there's not much of a motivation to go "against the grain". Safety in numbers.
For inspiration I look to the people who persisted in doing what they thought was right even if it cost them their lives. Without these courageous pioneers, slavery and apartheid might still be widespread, being gay would still be a crime, and it would still be ok to discriminate against women and beat your wives if they don't behave. The places in the world where those things still happen are considered backwards, and sometime in the future (perhaps the very distant future) humanity will look back at some of our present behaviours, including the non obligate meat eating, and think them primitive and backwards.
You say you don't care "how they chose to live", and that's fair enough, each to their own as they say. However it would appear that there are quite a few that do care how vegans live, enough to at least pass comment or criticize, which is one of the reasons that this subject is always so well attended by members of the meat eating majority ready to have a pop.