I will simply say this:
If the legal system is your framework for what is ethical and just, your ethics are fundamentally flawed and require a deep reconsideration.
It may be illegal to kill a monster, by the laws created to defend and protect the very same monsters, but it is not unethical.
If the fair mean was equitably applied to all regardless of wealth and/or power, only then would Thompson's death be unethical.
But it isn't. Otherwise Thompson would have been up on charges for, at the very least, accessory to murder, intentional infliction of distress with bodily injury, malicious negligence, and failure to render aid.
"B...b...but it was murder" is childish pearl clutching and holds no water in the face of all the provable harm that UHC committed while Thompson was at its helm. He had every opportunity to stop that harm and he chose, daily, to promote and continue it to enrich himself and others.
Luigi Mangione will go down as a class folk hero. He already is one and "tut tut"ing while looking down your nose makes you the asshole, not the people supporting him.
"Just take a look around you, what do you see? Pain, suffering, and misery." -Black Sabbath, Killing Yourself to Live.
“Man was born free, and he is everywhere in chains” -Jean-Jacques Rousseau
Purveyor of cute, fuzzy, pink bunny slippers.