It’s illegal to incite violence. This is a major reason there are no mainstream conservative voices calling for violence; people don’t want to get arrested.
I also don’t want to get arrested, so please interpret this post as merely an analysis of the facts on the ground. Don’t do anything rash because of it.
United Healthcare, and its late CEO, got a lot of hate for excessive denials of claims. Sometimes, these denials would cost people their lives.
I don’t claim to be an expert on the matter, but it seems likely that this outrage was justified:
Here’s a comment to my response:

A lot of conservatives have a knee-jerk reaction to ridicule and dismiss anything that triggers leftist outrage. Some of us reach a different conclusion after delving deeper. I’ll admit that I tend to be a bit slow sometimes, but let’s admit that:
a. There is such a thing as greedy, unprincipled, CEOs
b. The concept of “corporations” is sketchy at best
c. We should demand, from government and corporations, that they consider more than just profits
Generally speaking, rightists (insofar as they recognize the above as issues) seek to change the system through non-violent means.
Leftists have fewer qualms about using violence to change the system.
The Establishment Left, and its underground proxies, have always used violence to achieve its ends. From the French Revolution to the Bolsheviks to Antifa, the Left has operated in either an openly violent manner – or, more recently, under a thin veneer of “respectability” over a violent core. We saw this during the riots of 2020, when Democrat politicians encouraged violence, refused to prosecute it, refused to acknowledge it – and deflected by creating a “problem” of right-wing violence out of thin air.
The recent assassination of United Healthcare CEO Brian Thompson made this obvious. Many leftists came out of the woodwork in support of the shooter.
In contrast, if a right-winger were to assassinate a prominent leftist personality, there would be almost unanimous condemnation from right-wing circles.
We like to imagine that the modern world has moved beyond violence. That we’re somehow more civilized than our brutish caveman ancestors. The facts show the opposite. The 20th century, its winners and losers, was defined by violence. There is no indication that the 21st century will turn out any differently. In fact, it will probably be much worse.
With over 8 billion people alive on Earth today, there are far more opportunities to create corpses than there were during the great wars of the 20th century.
Muslims have always been about violence. It was either direct violence, or the threat thereof, that spread Islam throughout the world. This strategy continues in Europe. Non-Muslim children are beaten up in European schools, Native European women are harassed, raped, and beaten by Muslims all over Western Europe. European gatherings, such as Christman markets and parades, are targets for mass murder by Muslims. European politicians who oppose the spread of Islam require constant security. Some have already been murdered.
Leftism/progressivism and Islam are brothers in violence. Perhaps this is why leftists have so much respect for Islam; they look at Islam and see themselves staring back.
We live in a violent world. At some point, rightists will have to adapt. Evolution favors the strongest. The meek don’t always inherit the Earth.