These guys only hit the big guys, so why worry.
until the 2nd NY attack, most americans and westerners that had been killed by terrorism, were killed in small operations. these were carried out in small places made to make average people afraid. the modern arab terrorist movement can be traced back to the muslim brotherhoods start in the '20's. their goals have expanded as the years have gone by and their allegiances with other arab terrorist groups has shifted. their most visible acquisition has been al qaeda. it is safe to say that they recognized in bin laden a messianic figure and it didn't hurt that he had money. i think, after much study, that he has never been the operational planner of the terrorist attacks. he is just the passionate mouth piece.
a more frightening alliance is between the muslim brotherhood-al qaeda-hezbollah. this has expanded since the 90's and hezbollah is active in canada, south and central america, and here in the us. they are well funded and have much experience with killing.
guess that's kind of a rambling response to "why worry".
as for corrupt governements....we have a mechanism in place to change that. it's called voting. when a corrupt government stays in place, it is usually because the people are to dependent on that government for their survival. a dependent population makes decisions based on who will give them stuff. it does not make decisions based on what is good for all. that is why a "social democracy" is nothing more than socialism lite. the government controls the people though it's welfare programs.