Well, I don't have ESP. On further review, maybe HockeyBuckeye's first sentence (Post #1) can be read your way. Maybe. But I don't think the third sentence can. When all becomes "ALL," I don't see a lot of wriggle room.
Setting aside the question of who's been "bad," let's deal with the disagreement. If I understand it correctly, your position is that as long as a member school participates in most Big Ten sports, but has no program at all in the rest, that's OK. Apparently I'm also to assume that Club Sports "don't exist." But letting a school participate in B1G Varsity sports is unacceptable -- if they offer one or more Varsity sports in another league.
Whatever the merits, that's not the current rule. As others have pointed out, the inclusion of Johns Hopkins in the Lacrosse league set a precedent that one sport membership is OK. Still want to outlaw the practice? Go for it. Work through the system. Try to get a new rule passed. State your case!
Beyond "mixed feelings," what specific problems do you see with single sport membership? I look at the two deals that have been struck, and see a win-win situation for all concerned. Maybe I'm wrong to support those deals. But those wanting a ban need to tell me why. My feeling is that such a ban is a solution in search of a problem.