I called for Undecided mainly because there was no other answer that said Either. An insurgency's agenda is probably the most crucial factor for defining them as whether they're with or against us determines our label for them. Most modern day insurgencies that are bothered to be brought to light are labelled with terrorism as their agenda is to our disadvantage, or worse is a threat to us.
On the other side of the spectrum, insurgent groups that have assisted or benefited us in some way get the thumbs up in our books.
The French Resistance of WWII could be considered insurgents, they used similar tactics to what modern day insurgents would yet they are the good guys because they helped us take down the Nazis. I'd also consider the riots in Ukraine an insurgency, though relatively smaller. The Americans portrayed them as fighters against a corrupt government despite the brunt of the (insurgency's) leadership consisting of extremists and Neo-Nazis.
Read up on Svoboda(and no, I don't mean the S.T.A.L.K.E.R. faction)
Personally, I view this much like I view war and that is history is determined by the victor. Doesn't matter how much either side argues they're in the right, only matters which side will stand the winner. As our current events fall into the pages of history, only then will we truly see whether our modern day insurgencies were either fights for freedom or acts of terror.
P.S. Nowadays, the only insurgencies I usually see that are given green light by the US of A usually have a bone to pick with Russia or his friends in one way or another. Talk about reliving the Cold War days.
TL;DR:
Insurgencies go both ways,
America has a fucked idea of what's 'good'
The winner is the judge