Answer:
In some ways yes in others, no
Step-by-step explanation:
He had decent intentions but the way he went about it was wrong. If you didn't know already, people are destroying the earth because of littering among other things. So thanos wanted to make the earth better but he used more violence then needed, instead he could have tried to talk to the people about how their earth is dying because of them.
If you couldn't tell i'm a major marvel geek.