Another big thing is the reasoning behind their actions.

Luigi, allegedly, did so in retaliation against a failed system that had exploited people and routinely denied people healthcare to save a buck, one that he is directly a victim of. That’s something we can all be sympathetic to.

The other is just a right wing troll who shot another right wing troll for not being the right kind of troll. Nobody’s gonna be sympathetic to that except other right wing trolls.

It has nothing to do with their looks.

Though there is a point to be made that people do need to overall stop insulting people, even horrible people, for their appearance. It just throws people under the bus to stroke our egos with a low-hanging-fruit insult. Because of those insults we get people like OP who fail to understand the point.