If this doesn't make clear who thinks they stand the most to gain from ETC's existance, then I don't think anything will.
51% attacks are part of the protocol and code. The entire point of classic from what has been preached is that, "the code is law."
A 51% attack would simply help perpetuate that point and give classic supporters exactly what they want.
If you think TheDAO attack was fine (which you must if you support classic), then you should in principle think a 51% attack is fine too.