Because the "involved" ones aren't actually "Liberals" at all. Not in the classic sense. They are radicals, and the core tenet of the radical left is anger. It's how they bond.
The uninvolved ones, the unknowingly leftist, Democrat drone flock-members who reflexively pull the "D" lever, are usually just generally people who are unhappy in life anyway.
Their lives suck because they forgot to go to college, or to actually study when they got there, or they got stoned and turned forty before they remembered to get a job, or mommy didn't breastfeed them long enough, or any combination of a million other stupid reasons one can pick to be a pathetic loser and resent society.
As long as they can focus that angst outward, they don't have to face their own shortcomings.
They see in the success of others something they want, but they know they neither deserve or will ever attain, so their petulant envy manifests as anger at anyone but themselves.
They're all either in therapy, giving therapy, or want therapy.
Hayek refers to those who support individual liberty as “liberals”.
The “liberals” of today are nothing of the sort, they are group think collectivists.
Excellent observation.
You just described my brother-in-law and his family.