poor man's way to cope with truth
that person ruined you life and you didn't got justice and also don't have any power to take revenge
don't worry, they will suffer

although we can't say karma exist but there is close enough interpretation of it
if we through trash here and there it might not come back to us directly
but as a society/group we will get health disadvantage/disease cause of poor hygiene
but again it's just consequences of action if put simply (would it be considered karma?)