Because (it feels) like it's not possible to properly debate the subject in public. As a little/normal person the answer is always the same: "But but what if it was your mother/girlfriend/daughter that died in the attack?!". These are the same people that probably have been into contact with someone who has directly dealt with the consequences of police corruption, yet won't ever support "making the police's job harder".
Once an attack "gets through", which will always happen eventually, anyone that didn't support the PersonalRights-Devouring Anti-Terrorist Bill will get crucified by the press and their opponents.
Most people don't appear to care about numbers, or facts or evidence. They only seem to care about pushing their ideology (normally authoritarianism) that "makes them feel safe", rights and freedoms be damned (which is why I can never take the US's obsession with "rights and freedoms" seriously).
If panic is to be averted, the leadership of the West has to show that they take the problem seriously. As long as people are tiptoeing around even calling the problem what it is, hard-line sentiment will grow.
Tony Blair had some good thoughts on this lately:
""The centre has become flabby and unwilling to take people on. We concede far too much. There's this idea that you're part of an elite if you think in terms of respectful tolerance towards other people. It's ridiculous [...] You have to give a real solution and not one which is populist but false. If you don't give a solution, and you leave people with a choice between what I would call a bit of flabby liberalism and the hardline, they'll take the hardline I'm afraid."
Source: http://www.bbc.com/news/education-35862598
Once an attack "gets through", which will always happen eventually, anyone that didn't support the PersonalRights-Devouring Anti-Terrorist Bill will get crucified by the press and their opponents.
Most people don't appear to care about numbers, or facts or evidence. They only seem to care about pushing their ideology (normally authoritarianism) that "makes them feel safe", rights and freedoms be damned (which is why I can never take the US's obsession with "rights and freedoms" seriously).