I'm not sure we have the data to support that statement. 8.2B / 108B = 7.6% of everyone who has ever lived is currently alive. Perhaps some fraction of that is immortal.
The distinction between "government regulation" on one hand and "community-devised rules, local monitoring and graduated sanctions for rule violations" on the other seems entirely artificial to me. In both cases rules and enforcement are set up to avoid the tragedy. The latter just uses more feel-good words to describe local government.
The two party system is an inevitable consequence of the FPTP election system. Replace that, and you can have multiple parties. Otherwise, you might get a short period of chaos with multiple parties which then settles down to the two winners.
It wouldn't have worked. You'd never have gotten every single last case and then the exponential growth would have started again. Or, if that had somehow magically worked, the virus would have come back from outside.
And he then had some significant episodes in Voyager too.