It's important to remember that NIMBYs aren't actually protecting their back yard, they're restricting what others are doing in their fully-owned backyard. So if you're going to complain about YIYBYs, then the category of NIMBY doesn't really exist, it's just NIYBY.
> enthusiastically supporting development and/or sanctioned homeless camps
These things seem quite different from each other.
And zoning should be a city wide discussion. If a city doesn't zone for density near to heavy transit, the city is zoning irresponsibly and should no longer have local control, and the State should take over zoning.