Islam isn't bad, neither is Satanism, or Paganism, or any other one that gets a bad rep. People have a tendency to see the darker side of things more than the lighter side. You remember the tragic events of 9/11, but how often do you remember the people who tried so hard to help save the people that were still alive being crushed under rubble? Probably not nearly as much as you think about the initial act of it happening.
The extremists who do 'bad' things (by bad I mean what the majority consider to be bad) get remmebered far more than the extremists who do 'good' things. (by good I mean what the majority consider to be good)
I use the parentheses because those people who did the bad things most likely assume they were doing something just, noble and good, in the name of their religion.
It's all brainwashing basically, most every religion except christianity will have a worse rep than chrisitanity because here in the US christianity is the major religion and what this country was founded on, so of course those who run it will want to keep it the majority and shoot down othre religions. And by run I don't mean the President or Congress too much. They don't really run it. The people do, news, media, etc, that's what really runs this place. And what they say goes into your head and starts to sway your opinions. That's one thing this country doesn't need more of, people who let and news and media think for them.