If it had been a lab leak, how would that change the behaviors that everyday people would have had to take? The social distancing, masking, handwashing, quarantining would have all been identical.

Maybe it wouldn't change general hygienic practices, but it might have a impact on voting preferences to find out who was funding the research that led to the creation of the virus and the leak.

Huh? What person fixated on lab leak claims would have changed their voting behavior?

If Joe Bloggs didn't die peacefully in his sleep as we were initially told but had in fact been murdered, how would that change where we buried him?

It wouldn't change where we buried him at all, but it would materially change many other things, at least in the minds of people opposed to murder.