This gets into the whole "letter of the law" vs letter of the real law. Most of us would not agree with state law/university definitions of hazing. Often, requiring a pledge pin could be illegal. Sending pledges to a "greek 101" type anti-hazing meeting many schools require could be illegal
I think that our position, pragmatically, is to employ a "stupidity meter", so to speak. Public pledge humiliation, for instance, is probably treated more seriously that private activities. Is that right? I'm reminded of the line from Animal House, "they can't do that to our pledges, .........."
I think the key is to get members to think about each activity they involve pledges in and what it is supposed to achieve, and try to design activites that accomplish the same goals in as low-risk a way as possible. But often "pride goeth before the fall" If everything else is going well, chapters are often reluctant to address pledge program issues.