Do you care about people _now_, even though their existence is finite and at some point anything you may or may not have done to affect them will cease mattering?

Are you asking really to ask, or is this a entrance into a philosophical debate?

The answers so far are a little snark, however this topic has been debated for a long time and most of the pro/cons can be listed rather easily.

for one, it is just rhetorical, nobody knows if there is really no afterlife. Every bad you did might be a Jira ticket in hell now.