Uniformed Israeli soldiers use public buses to travel around Israel while they are on active duty.

Therefore, a public bus, as a known alternate transport for military personnel, is considered a military target.

A suicide bomber has explicit control of the detonator. He can choose which bus. I have seen reports that indicate, among the dead passengers, Israeli soldiers. Is this then just as much of a military target as a house that contains, among others, people who are military targets?

Think about this. If it's "too bad" that Palestinian civilians get killed in a military strike against a legitimate target, i.e., a guerilla leader or terrorist cell, isn't it just as "too bad" that Israeli civilians get killed in a military strike against a legitimate target, i.e., several uniformed soldiers taking the bus back to the front? If living in a house without a big red X on it ("Terrorist Den") is "using civilians as shields", why is taking a public bus instead of military transportation not the same thing? Is it because Israeli fighters are people who are just trying to live a normal life, but Palestinian fighters are the spawn of Hell who have no need to live among other people?

Of course, now the whole thing has spiralled far away from collateral damage...