The fallacy is you're assuming 'destroying ourselves' means that everyone is dead (I guess?).

Take French Canada for a great counter-example. One could argue that the mailbox bombs and kidnappings of the 60s/70s were fine because Montreal is a very beautiful and livable city today.

However, it caused hundreds and thousands of people to flee their homes and caused Montreal to lose its place as Canada's leading city.

Don't confuse 'humans are adaptable' with 'anything goes and civil society is pointless.'