@ Bilal :
Mate, the problem with your approach, in my humble opinion, is that if we go down that path of ostracizing a particular group we may end up becoming the very things we swore to protect ourselves against - a certain brand of Fascism. I'm sure that there are Salafis out there who don't see eye to eye with many of what the rest of us do or donot do - fine, let them. Let the natural barrier provided by Human intellect and the traditions of our forefathers work against that. As for them exclaiming that something may or may not be Biddah - they are right, this word didn't come out of thin air, there are belief systems out there that are rather innovative at the expense of the very fundamentals of Islam. Reformation movements the world over from the religious (Calvinism) to the socio-economic (Communism) or the political (Social Democracy) have all exclaimed the same thing - that our system is better than yours, that its truer that yours etc. We human beings are incessantly engaged in a d**k measuring contest one way or the other and we've practiced Takfir in one form or the other across the board. In the recent past - weren't the Capitalists and the Communists doing the same thing ? Now its Islam in place of Communism. On either side there are people divided across the spectrum between inclusivity and exclusivity. So you can't really look at this from the perception of what one is saying but rather whether they materialize that in action. Thats where acts of extremism comes in, thats where we get the moral right to act in reply...otherwise, our modus operandi should solely rest with propagation of our side of the story through logic, reasoning and through right action.
As for how these guys may not adjust well enough to Secular societies...true but just as true of how Christian Reconstructionists can't either. Polls and finding over findings have shown that more acts of extremism are done in the West by right-wing conservatives than Muslims. In fact, I remember something to the effect of how Mr.Ramadan quoted a statistic that 10/11 acts of extremism in Britain over a period of a few years (I think...but you should try watching his show on Presstv - Islam and Life - it deals with a lot of these issues) were done by right wing extremists and only 1 by a Muslim religious extremist. So yes we do have a problem with these people preaching what they are and possibly the Taliban are what happens when such a dogma meets guns....but the vast majority of them out there are peace loving and they would want to preach you what they think is the right way peacefully just as so many conservatives of other faiths or socio-political belief system do. So let them - just do your homework on your part and preach in turn what you think is right and let the people decide.
And besides where would you cut-off. Where would you decide that such and such a thing is far too problematic for our young and old alike to be preached too ? I've personally been declared a Non-Muslim by Sunnis and Shites alike... for the former because I talked about the need for their to be a Reconstruction of Religious thought in Islam (to quote Iqbal) and I happen to idolize Umar bin Khattab as a leader for the latter group. Similarly I've been declared an imbecile and lacking any and all intellect by an atheist friend of mine, because I still believe that I can find worthwhile things in something written 1400 years ago. So where...where do we draw the line ? We can't...we just can't practice a mild form of Takfir ourselves and curb the spread of Salafism per se. What we can do is try to educate the masses as much as we can so that they can think independently for themselves and critically analyze whatever is put forth before them. Its much more difficult of the two practices but it would also, in my opinion, serve as a much more potent and lasting deterrent against any extremist ideology and the acts thereof.