Perhaps his time would be better invested in understanding what has driven these suicide bombers to the point of such despair, Its quiet simple its the continued illegal occupation of their land with no real effort on the part of Israel to resolve the problem and neither will they while Israel continues to be funded by the US. Remove the support and Israel will have to negotiate This is how Apartheid in south Africa was overcome.
Is the Gaza strip still "illegally occupied" by Israel?
Yes - occupation doesn't only take the form you're alluding to.
“I’m not talking about what we should or shouldn’t do,” Kedar insisted. “I’m talking about the facts. The only thing that deters a suicide bomber is the knowledge that if he pulls the trigger or blows himself up, his sister will be raped.”
This is actually reasonable thinking it may be morally wrong ect. But in war morals can be thrown out the window. It is also very much a cultural thing. In the arab world a man feels that it is his job to protect everyone in their families from the second they become men till after their death. (thinking about it it is like this all over the world or it should be.)
No, even in war, you can't throw morals out the window. It seems to me that a more reasonable approach would be to end the brutal occupation the Palestinians have been subjected to for half a century now; that would greatly reduce the radicalization of the population (on both sides).
