While I think these people definitely exist I don't understand how they need to be in the community from either an activist or social point of view. I, as a lesbian, want sexual and romantic relationships— what interest would I have in dating ace people? Also, I do not see that they face the same level of discrimination either legally or socially. Ok, people may be a bit weird at first about the fact that some people don't date or have sex but I've never met someone who was hateful about it or discriminatory towards someone— at least in the west anyway. I could see how in some cultures ace people might find that they are forced into hetero marriages or something and that is very worrying.

Unrelated, but I don't buy into the split attraction model as I think that romantic love and sexual love are really two sides of the one coin. I can't see how someone would be unable to have romantic attractions (but still have sexual ones) unless that had some psycho-social issue going on like a personality disorder. It's more likely they just haven't fallen in love with someone yet. It also creeps me out how there is a sentiment in the community that asexual people can / should have sex. If you're not into someone sexually I can't see how it would be a good idea to have sex with them, it seems rapey to me.

Edit: personally I wonder if there is a developmental delay / disorder angle to this, at least in part. I have ASD and can see how someone might think of themselves as ace / aro when they are lonely, socially isolated, have trouble forming friendships and strong connections with others. Like, if you never meet people and get to have friendships with them you can't fall in love! So of course you would probably think you are asexual. And for many people sexual attraction follows romantic attraction so I can see how that would get lost in there too. Nonetheless, that doesn't seem to be every asexual and there are plenty of people who say they don't experience attraction despite the opportunity to so I think there is something to it.