As soon as violence will better serve their ends, they will use it again.   

True enough. "They" being Sharon and Co every bit as much as the people on the other side. It can reasonably be claimed that it was the Intifada that brought him into office and kept him there.

Anytime anyone thinks violence will help achieve some goal, it's easy enough to wind it up again with an assassination here or a mortar there, and set off the cycle of retaliation and counter-retaliation once more.