Putin?
Islam?
Also suggested above:
Socialism
Liberalism
I was about to add "US weakness / US lack of integrity / US forgetting WHY we have been the global "enforcer" of international order (relatively speaking) for a generation... But then (except for the forgetfulness) that all sort of fits under liberalism if one considers the bigger picture. That's not to say libs won't bomb the daylights out of people, Libya or Serbia being examples.
At any rate, these things cannot be considered in isolation. Radical Islam is probably the lesser threat, but it would be only a moderate problem if European people were not so lib. (The US, due to 911, is somewhat more on guard, tho' with Obambi in charge, that too is now questionable.)
Putin similarly would not be a major threat if it were not for Western weakness, though he does have his act together in a way the Muslims never will. However, it is the long term repercussions outside of Russia, of Russia's new expansionism without firm response from the West, that is truly dangerous.
We have on FR a lot of posters who seem blissfully or willfully ignorant of a crucial question:
In a nuclear age, and keeping the history of human behavior well in mind, what is the practical alternative, for freedom loving Americans, to the US being THE "International Cop"?
Practical alternative is being an HONEST cop, not Bad Lieutenant.The world would appreciate it and many would jump to help.
Do you have any idea how cynical it sounds in translation when the International cop speaks on war on drugs while arming drug cartels and facilitating narcotic crop expansion?
Do you have any idea how cynical it sounds in translation when the International cop speaks on war on terror while aiding and abeting Muslim terrorists to capture one country after another and slaughter Christians?
Do you have any idea how cynical it sounds in translation when the International cop speaks about democracy while staging coups or assassinations of democratically elected leaders?
The crimes committed by the bad cop are so numerous, and so well known, affecting hundreds of millions of people worldwide, that they are riling up the world neighborhood. He is feared and despised, not respected.
Last but not least, this International cop is doing poor job for Americans. Freedom is life without fear, not "just another word for nothing left to lose."