be for/in a good cause

be for a good cause

To have a beneficial, often charitable, aim or effect. Oh, the money's going to charity? Sure, I'm willing to donate a few bucks, since it's for a good cause.
See also: cause, good

be in a good cause

To have a beneficial, often charitable, aim or effect. Mom just wants to keep you out of trouble—her rules are in a good cause.
See also: cause, good
Farlex Dictionary of Idioms.

be (all) for/in a good ˈcause

worth doing, because it is helping other people: Most motorists seem to accept that the speed cameras are all in a good cause (= they help to keep people safe on the roads by stopping people driving too fast).
See also: cause, good
Farlex Partner Idioms Dictionary
See also:
  • be for a good cause
  • be in a good cause
  • put (one's) hand in (one's) pocket
  • put your hand in your pocket
  • put your hand in/into your pocket
  • same here
  • that makes two of us
  • I gave at the office
  • the same with me
  • get one's money's worth, to