From the deaths caused by denied claims to unnecessary suffering to the harm of medical bankruptcies to all the indirect problems from the health insurance mafia monopolizing local health care which causes a host of issues from the big to the small, I think I think the bad/suffering/evil caused by the CEO of United's actions far outweighs the ill caused by his killing. Of course this won't solve the systemic issues alone but the schadenfreude from the CEO's death is perfectly understandable.
I'm not sure what your point is with all this sarcasm and outrage that people aren't showing enough sympathy for your taste for this horrible human being. Seems like a strange hill to want to stake your flag in the ground and fight over.
And
@AfonsoAlves if you want to play the "only a symptom" card, then as others mentioned, you can't then condemn the shooter either, since that person is also just a symptom of the system.