All you need to know to understand that they're not saboteurs is the following quote from their website:
Is Bitcoin Cash different from 'Bitcoin'?
Yes.
If they don't claim to be Bitcoin, then what are they supposedly sabotaging?
some of what they're doing, such as ddos'ing the bitcoin network and the exchanges
Not all supporters of BCH are doing this. I can't even find any objective or clear evidence that anyone is doing it with ulterior motives at all.