No. The only organ that can make "binding" decisions is the security council. Unfortunately all decisions (except for administrative questions) need the approval of china, russia, the UK, France aaand the US. So I doubt that tha the US will ever sanction Israel because it would mean they are admitting to supporting war criminals.

It adds a lot more legitimacy to people protesting the crimes, which is important.

They don't, just like the league of nations could stop Hitler.