By all means, you should have the right to control your lifespan. Please let others make that choice too, insofar as the universe will allow us.

replace 'others' with billionaires and this statement is more accurate.

Many tyrants have been multi-generational. Many have been deposed, so death can't be the "only" equalizer. And many modern "tyrants" are organizations and systems, not individuals. And who knows, maybe tyrants will act more sensibly if they expect to live in the future they're harming (wishful thinking perhaps).

If you take antibiotics when you're sick or choose your diet based on health concerns, you're not fine with the life expectancy you have. Natural lifespans (my words, not yours) don't make any sense with the level of intervention we do.

I like to imagine that choosing how and when you will die will one day be right there with self-actualization in Maslow's hierarchy of needs.

I am both profoundly fearful of death and also incredibly excited to see what's coming, so I'm rooting for success here.

This research would protect us from aging, but not from bullets or poisons. The likes of Hitler and Stalin would have still died at about the same time had anti-senescence treatments been available to them.

Meet the new tyrant, same as the last tyrant. It doesn't really equalize anything. All that means is churn. There's no guarantee that changing to a new tyrant will result in something better. It might even be worse.

All though human history, we have kings, emperors, knights, and so forth. Now dictators and elected politicians. Some of them enacted absolute calamity and caused the death of millions. This can continue before they either die in office or are assassinated or overthrown.

Human societies are always changing, even under dictatorships. Political collapses are always going to be possible if you have a system that continue to deteriorate. The mistake that people make is living forever is assuming that power structures don't change. Humans are not rocks. We change and react and have agencies.

This works out to, "Kill all of humanity to make sure tyrants die too."

Perhaps there is a better way?

Historically speaking, the end of tyranny or dictatorships is almost never due to the person at the top dying of old age.