They might even understand that but if they think that they'll get more votes by banning e2e encryption, they'll ban it. If people will sideload WhatsApp, they might not go after them. They'll keep the extra votes coming from "we care about the children" and lose very little votes for the small inconvenience of sideloading once.

By the way, does a sideloaded WhatsApp on Android still update from the Play store? And what will iPhone owners do?