[quote=@Etcetera]
<Snipped quote by Stabby>

What if something along our timeline is disturbed and they are never born?
[/quote]

That's the interesting thing. The way time works is odd, so sometimes it acts linear, and sometimes it doesn't. But in the moments where that does happen, the other members of the group investigate the cause and then, if it was caused by an outside force, fix it. there have been cases though where someone is erased and they aren't put back due to it being more beneficial for that timeline as a whole. In fact, most of a Limiter's work revolves around getting rid of villains that didn't exist in the first place.