Why do anything?

[kycahi]

After he achieved happiness aka Nirvana, the Buddha spent the rest of his life trying to teach it to others. I am sure that many of them also achieved it, and more got closer to it than otherwise.

So that's how he went about ridding us of suffering: one entity at a time. It's still going on, thanks to many Buddhism teachers. That's not my religion or anything, just answering the question, For what it's worth.