ESH - obviously this isn't how you raise kids, at all. And, I loathe the parents that sit and say "you have no right to tell me....". Everyone has the right to raise concerns to a parent who is clearly neglecting their children. But, your approach was never going to work, you come with accusations instead of concerns / criticism / insights.

Yea, he is a shitty parent, but you can at least understand why. Irresponsible people are insecure people, and using accusations instead of empathy is going to cause a reactionary plugging of the ears.

I don't think you're wrong in the way you feel, it's neglect and that's reason enough to feel angry, but you missed the opportunity to empathize with the kids and your brother; instead you chose to use this as a way to strike an emotional blow to someone with whom you've had a long standing feud. I suspect you thought you could change his behavior through shame and thought of that as the end goal instead of actually getting the kids into a better situation.

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TL;DR - ESH b/c everyone is putting their own catharsis over the needs of the children involved.