The fact that a tactic works in one place (and there's a lot of argument as to whether that applies to all those cases) doesn't mean it will work in another place and time and in totally different circumstances.

In Northern Ireland I think probably the most effective single military action taken by the IRA was the one that involved the Ten dying on hunger strike. And the most disastrous day for the occupying army was Bloody Sunday.

If the young Palestinians who died as suicide bombers had died publicly, but in ways designed to avoid killing or physically threatening other people (and in ways that would have made it impossible for them to be described as "failed suicide bombers", of course), they would have done far more to advance their cause, instead of strengthening the hold on power of the extremists in Israel.