To me, category 1 is the majority of them. These are both the best and the worst Liberals all in one.
These are the Liberals that will cry over children at the border. They put zero to little rational thought into problems like illegal immigration, but say things like "we can let them all in, we can do this, those poor kids, this isn't who we are" without thought for the how, the economics involved (as you state), or consideration of the ripple effects of doing these things. They are always "all in" without investment.
This makes them the most dangerous because they will fall for anything through emotion. Liberal pols LOVE this group because they can sell them anything.
This is also the same group that, if you told them they would need to house an illegal immigrant would also emphatically say no. They want no hand in the solution process.
This is the Disney feel good crowd.