That one also has the aspect of avoiding a deliberate insult. Desecrate the corpse and you risk turning it into a Thing™ that people might rally around.
killing him does that too, but people rally a little less around a relatively restrained killing of a valid military target and unremarkable handling of the body.

The worst person in the world, while living, looses all consideration for how they’re treated. At that point, it’s not about what they deserve as much as it’s about living up to our own standards for how we compose ourselves.

We don’t feed evil people to rabid hogs not because they don’t deserve it, but because we respect ourselves more than that.
Likewise, everyone deserves a baseline level of dignity in death because that’s a standard we hold ourselves to.
It’s not for them.

https://upload.wikimedia.org/wikipedia/foundation/f/f6/Wikimedia_Foundation_2024_Audited_Financial_Statements.pdf

Their hosting is a couple million a year, and they have $80 million in cash, not $250.
Their cash flow from donations after expenses is about $6 million.
They absolutely cannot keep running for 400 years without further funding.
If nothing else, people are needed to run the servers and actually manage the basic operations of the foundation.

They’re definitely not in a dire financial situation, but they’re not centuries of hands off operation by any means.