People can boycott the company. People can organize protests. People can use other healthcare companies. People can lobby to setup other types of healthcare systems.
Murdering someone because you don’t like them isn’t the answer.
Ah yes, let me just boycott my health insurance provider. Since it’s provided through my work, it’s real easy and convenient (not to mention cheap!) to switch to a different provider. And as for socialized medicine I’m sure Congress will get right on that, just as soon as the Democrats have a majority in the Senate. What’s that? They already had that and they sat with their thumbs in their asses not passing any laws because of something something bipartisanship? No matter, I’m sure it’s fine. If we put them in charge again I’m sure things will be different! We just need to vote!
There’s other options for health insurance: