Well, solving death without solving aging wouldn't be that great, so I tend to look at anti-aging as the main path.

I think that people who don't get on the "death is bad" train do so because they don't take seriously the idea that there's any alternative. And certainly, if you're 80 years old and in poor health and going around denying your own mortality, you're probably in a worse mindset than somebody who accepts that they will soon die. Until research gets to a certain point, being a proud anti-deathist is just pretentious windmill-tilting.

In a few decades maybe technology will hold the serious possibility of living indefinitely, and people will be making choices about whether to receive certain therapies or genetically modify their children in some way; and the arguments to make will be much clearer.

But also, "Dragon Tyrant" is definitely kind of narrow because it very transparently calls politicians murderers for not putting more effort and funds into anti-death research, which is a bit more than the broad stuff you're saying.