War on drugs.

I’m not sure how higher supermajority requirement would have prevented the war on drugs from happening.

There was alignment both at the elite level and the popular level in support of those policies for a long time. It functioned because the minorities it target were politically weak.

That's not a positive example of what I was referring to.

A positive example would be something that would have passed if the majority party wanted it when the minority party was against it.