Is suicide bombing justified? Sure.Well, that's out of the way at least.
Now it's just a matter of finding out what YOUR criteria are for it.
When you drive you plane into a shipful of soldiers.See? This is an example of what YOUR criteria are.
Preferably the ship that just destroyed a city.Again, YOUR criteria.
How about killing 23 guests at a restorant? Or students at univercity?Again, YOUR criteria.
The question you give is stated to kill any possibility of "incorrect" answer. Good job.Because there IS NO "incorrect" answer.
Once you approve of the ACTION, it only comes down to values.
Now, YOUR values do NOT include "defending Islam".
But, from the survey, it seems that many other people do have that value.
THEREFORE, if we want to STOP the suicide attacks, we need to NOT be seen as attacking Islam. At least by the majority of the citizens.