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In answer to the original question, I was always told and I'm sure I've read somewhere that BIB and clips were saftey issues, which is why they are illegal. The runner can't see them coming and can't brace for them. That's the only difference between the illegal block in the back vs. the legal one in the side or front. (When clipping was made illegal a block below the waist from the front was still legal.)
Obviously a bump or slight push from the back is not a dangerous play, but a hit from the hard enough to knock a player down or seriously off balance would be a saftety issue. At least is seems to be in the eyes of the rules makers.
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