Maintainers MAY merge incorrect patches from other Contributors with the goals of (a) ending fruitless discussions, (b) capturing toxic patches in the historical record, (c) engaging with the Contributor on improving their patch quality.
I asked around and asked in the C4 specification matrix room.
And the reason is actually simple. If you merge bad code, have a record of proof in git (pull requests aren't forever it's only a github/gitlab thing).
So the idea is if you merge bad code you have proof in the git record that there is a bad actor. You can always revert the commit again or fix it. And the record can act as a proof in case the community want to get rid of bad actors.