I have seen rebels attacking repeatedly, quite notoriously if they own both Pomerania and Prussia.
In one of my Byzantine campaign I had a major problem with continually escaping rebel ship that damaged my trade, for about 40 years or so...
I keep rebel buffers only when I do not want to get involved with other powers (avoid early taking of Toulouse while playing English to postpone war with HRE, Aragon), or if I want to lure them out to less defensible position.
Otherwise I agree with Sensei warrior and others - I attack rebels almost at any occasion, especially if it is beneficial to trade (e.g. Sweden).
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