I realize that from a Judeo Christian perspective it's quite disturbing, but from the fundamental standpoint of what constitutes a suicide bomber, Samson was indeed a suicide bomber. It's important to remember that there are always differing perspectives, but they're not always equally valid. In this case for example, given the benefit of time, and a hard earned understanding of how people use such concepts as honor and martyrdom to justify all manner of atrocities, it's important to realize that sometimes things done in the name of a cause... even a justified one, say more about our propensity for violence then they do about our desire to embody the spirit of Micah 6:8.
Look back across history and tell me how many atrocities were perpetrated in the name of a just cause, because those are the things that our history is littered with. Not to say that there isn't such a thing as just causes, for indeed there are, but even acts done in the name of a just cause have a cost, for they define what we are as the children of a loving God. We're violent... we simply find a way to justify it, and then pretend that that justification made it right. But quite often being justified isn't enough to make an act righteous.
I'm sorry if you think that the OT is somehow supposed to serve as a shining example of how we as humans are supposed to behave, it didn't, that came a few centuries later, when we were shown that what's justified isn't always what's righteous... and sometimes that's a very hard choice.
So yeah, Samson was a suicide bomber, he died for a cause. God I'm sure will understand, as should we. But think of him the next time people die.