> My fear and suspicion however is that "Al Quaeda" has become a term that is applied whenever there are "people, who happen to be Muslim, who shoot at 'us'."
That's possibly true, but that isn't necessarily a problem.
I think an uncomfortable reality that westerners will have to eventually come to grips with is that militant Islam is a problem. Now, I don't believe it poses an existential threat to western liberal democracies, but it's an incredibly powerful unifying banner for culturally regressive movements all over the world. I do believe that these movements are a threat to progress in the countries in which they operate. If calling it all "Al Qaeda" gives us the wherewithal to combat it, that's not a bad thing, especially when those groups take up the banner.
As a university student in Bangladesh during the independence war in the 1970's, my dad had high hopes for the country. Over time, he has become bitterly disappointed by the country's cultural regression. Instead of seeing secular democracy flourish, as intended by the original constitution, the country is seeing Islamization. Women are putting on head scarves and extremist Wahhabi madrassas are sprouting up and terrorists are starting to operate: http://en.wikipedia.org/wiki/Jamaat-ul-Mujahideen_Bangladesh. When my family lived in Bangladesh in the late 1980's, it was poor and full of crime, but the most you worried about was violent protestors at labor strikes, not organized, armed terrorists.
There is something happening in the world and you can't wish it away.