What were these six dead Israelis doing which required this suicide bomber to "defend himself"?

According to Hamas the suicide bomber who killed six people in a falafel restaurant in Tel Aviv earlier today was acting in "self defence". Their spokesman even went so far as saying "Our people... have every right to use all means to defend themselves". Even if you take as given the assumption that some Palestinians are being heavily oppressed, the doctrine of self-defence cannot be stretched to permit any attacks of whatever brutality against anyone.

How were the civilians killed by this explosion in any way threatening this suicide bomber or the wider Palestinian people? Yet again, Mahmood Abbas is closer to the mark than Hamas. This runs counter to Palestinian interests, is another unwarranted attack on Israel and merely suggests an unreasonable and unreconcilable brutality amongst Palestinians. This makes it easier for the Israeli Government to act in a hostile way towards Palestine. How sad that no remorse is expressed at all for the loss of innocent life.