You are absolutely right in that honest assessments are necessary, but how would anyone correctly divide between the wheat and the tares? The worthy, worth saving, look exactly like the unworthy. Only after some individual progress is made, do the worthy begin to reveal themselves.
Besides that, I have a grandson who keeps insisting on making bad choices. His father started him on that path, in part, by not being a good role model. No matter how many times he fails, I will be there. Tough-love of course, but if he someday decides to fly right, I will give him a jump start.
Naturally, I love all my grandkids. How much love can I spare for someone else's grandkids, if they are one of the filthy masses? One of the ones pilfering things off my porch, making a mess in my back yard? Breaking out a window to rummage through my car?
This is the point where I find out a lot about myself. Where do I draw the line between feeling like a patsy, and really caring if someone else lives or dies?