Just out of curiosity, why are conspiracy theories needed to explain what's going on? man, these kinds of rumors just degrade the actual threat 'radical' islam poses. We can blame bush, obama, or whoever.. but the root cause of all these problems lies within isLAME. I suggest you read up on the wahhabi/takfiri sects of islam. As long as these interpretations (which originate, or were revived in the GCC nations) continue to poison the minds of young muslims, we will continue to clash with them. Then there are the almost as crazy shia like the regime in iran and hezbollah.
While I agree that arming mugs in libya, syria, and probably even now in iraq is stupid, this is not for them to turn against us in some kind of conspiracy. It's the same old govt incompetence that gets discussed here daily.
There is footage of rebels in syria using US made weaponry including anti-tank TOW missiles. It is also true that a lot of those arms are now in the hands of isis because for a long time, they were not fighting the syrian regime, but taking territory from other rebel groups. And because the iraqi army fled and abandoned all kinds of equipment, including stingers, tanks, and even SCUDs. There are many groups fighting the regime in syria, and all the groups that matter are part of or allied with mujahideen organizations. If isis is destroyed, then al-nusra (AQ arm in syria) will take their place, AQ is not gone, they are just out-shined by isis at the moment. We need to snuff out all of these groups, and those who back them. That was the whole point of the invasions to begin with. If not, then we at least need to secure ourselves, tell everyone else they're on their own, and hope isis and iran end up killing each other. Of course, this approach can also have consequences such as a much higher cost of oil.. which is our whole reason for meddling in the shithole middle east to begin with.
isis is not from libya. They may have allies there as they are now the face of the jihadi movement, and there might be guys who fought in the libyan civil war, now fighting for them, but isis was al qaeda in iraq. They are responsible for many American deaths during the war. There are also many Chechen/Georgian muslims who joined their ranks when they became isis. They most likely enter syria and now iraq through Turkey, a NATO member and another untrustworthy ally of the US.
I also agree that it is indescribably retarded that our southern border is not secure.