the meme of "groomers" is just alt-right shorthand for anyone who holds the first viewpoint described by OP -- it's an epithet used against people they dislike, not an accurate criticism to be taken literally

for a good illustration of this, examine the politics of people who organize, attend, and participate in actual underage beauty pageants in the US -- the last US president, for example

it's not surprising, because the point of beauty pageants is to reinforce the conservative stereotype that a woman's job is to stand there and look pretty

you'll also note that, as mentioned above, conservatives don't apply the term to breastaurants when children are present there -- I didn't see a response to that, and it bears repeating