Disregarding the irony of your authoritative stance, as it is your opinion...It's not only possible but better to do both?

I'm with you on the TL;DR that equals mindfulness is more work than virtue signaling, but did you consider that internet arguments,(communication) are as intrinsic to the human experience as porn and memeing?

You can work a job that helps others, volunteer in your local community, and practice mindfulness while attempting to elevate and spread good vibes to others.

I don't recommend anyone try to do all of them at the same time, and in the case of jobs that's not even a healthy consideration in the face of modern life pragmatics. Which we should change yes, but that's another discussion.

Your observations are valid, and correct. For everyone. But it's a "some of the time" thing; It takes practice and support to become the kind of person who can actively choose to put aside those coping mechanisms.