I think most Americans don't really realize the predicament of Europeans. It's easy to call European cowards when you're not facing their problems.
I do believe that the biggest mistake Europeans made was to allow themselves to be invaded by greed and lose their work ethics. I have fond memories of the Northern Europe of the Seventies and Eighties, where impeccable business and work ethics and almost complete absence of greed-driven behavior created a haven for the working class -- and a very successful economy. Unfortunately, in the nineties, laziness and greed took over, the work ethics vanished and things went downhill from there.
[WARNING: I'm going to play the Devil's Advocate here for a moment. Do bear in mind that what I'm going to write now does not necessarily reflect my personal beliefs -- it's just to better show the size of the predicament Europe now faces]
One can easily argue that loss came from the invasion of both Arab Muslims and Eastern Europeans, neither of which had those ethics.
Americans complain of Latino and Asian immigrants; however neither of these cultures lacks a fundamental sense of work ethics. In fact, they tend to work very hard -- and even if there are many compatibility problems, and illegal immigration is a dramatic problem here, it PALES in comparison of having a whole continent invaded by people who not only lack any work ethics, some of them have viral behaviors -- in the sense they not only won't allow themselves to be assimilated, they will, in fact, want to change Europe into a Muslim continent. Much like Christians did with America and Africa -- not that many centuries ago.
The problem, and the fundamental predicament that Europeans face, is that, currently, there is very little they can do. They cannot ask them to leave. They cannot do anything legal to force them to leave, since they are citizens. Yes, most of "them" (Fundamentalist Muslims) have EU passports.
Plus, even suggesting anything remotely effective, even saying what I say above is easily construed as Nazi spiel -- even though most Europeans, deep down, agree with it -- and nothing short of a -- gasp! -- "Final Solution", this time directed against Muslims, would be... a final solution.
And while Muslim Fundamentalists would be more than happy to personally kill all non-Muslims, the fact remains that most non-Fundamentalists (Muslims or otherwise) are incapable of even remotely suggesting a "Muslim Final Solution". In fact, I might be going to jail right now if I were writing this in Germany.
The thing is: "they" are in Europe. Securing the borders won't do anything. The London bombings were an inside job. People have, by now, forgotten the Paris bombings, since they happened before 9/11 -- but that was an inside job too. There is absolutely NOTHING Europeans can do to prevent a terrorist attack, since the terrorists live there already, are impossible to single out -- much less kick out -- and have easy access to all kinds of lethal materials. Heck, many of them probably work in factories that make those materials.
Remember: terrorists are not afraid to get caught. Most of them are even convinced they are not afraid to die.
Tomorrow a group of terrorists can blow up half of Berlin and there isn't a damn thing anyone can do to prevent that.
Europeans are being held hostage in their own countries. Americans need to realize that and stop calling them cowards without having the faintest understanding of how that feels.
It's like having a hornet's nest inside your living room and not being allowed to kill it.
What I am most worried about is that fundamentalist Muslims push Europeans so far to the right that we'd have another Hitler in our hands, possibly before the end of the 21st century.
Maybe then you won't have Americans calling Europeans cowards...
In the meantime, here's hoping that Europeans take the high road -- and understand that the best way to fight this is to go back to their values of the 70s and 80s and not let greed and laziness take over.