When it comes to defending your homeland, no one except the invaders are going to consider you terrorists. Fighting back against a foreign military, international law, political sciences, no one of reasonable and sound mind will consider that terrorism. But yet this poll does.
Israel/Palestine, post-invasion Iraq, etc.
It would not be a useful control figure if you didn't take these issues into account.
Whether you agree it should be the correct definition or not, it is in common usage.
You can't spot an "unscientific one" just by looking at an image like that. What we can tell by the sources of these polls is they come from a variety of sources. That the first give are pretty close and from different sources indicates the pollsters may have had a decent poll. But we need the actual questions and sample base to know for sure. It could also explain why the last two are such outliers.
The point is none of them are scientific (and even if one was you couldn't identify it from outside)
What you can spot is that the MOEs cannot be correct on all of them, despite the MOE being 'scientifically correct' as per the methodology of the compiler of each individual poll. The 'outliers' were actually the most accurate btw.
Research has shown that comparing the MOE on polls should be significantly higher (perhaps double) than what is stated and political polls are far easier and more accurate than 'tacit support for terrorism' polls.
More scientific polling would have a larger MOE, and wouldn't draw conclusions based on anything with this MOE.