Those "kiddies" are no worse than the "OMG it's happening" posters. As to why it "feels" like they'd rather Trump stay in office, I'd look at yourself for that answer, because I highly doubt any of them would actually prefer that, given that they're as anti-Trump as anyone else in the thread. They're just pessimistic about the GOP's chances of being adults.
Speaking as someone who's not optimistic about impeachment, much less removal, I'll be thrilled to be wrong. But one requires a House majority, which is extremely unlikely, and the other requires a 2/3 vote in the Senate, which is an order of magnitude less likely than the first. It's not immaturity, it's simple math: as long as Trump's approval among Republicans is high, it's simply not going to happen. Nixon's breaking point was 50% approval within his party. Trump has a long way to go to get in that area, and with Fox News and other right-wing outlets - the only places so many GOP voters get their info - actively obscuring or downplaying Trump's troubles, why would these voters change their minds? They wouldn't seem likely to even if exposed to the news absent being told what to think.