US citizens have a relationship to their government which obligates them to oppose its crimes against themselves and others. Because this is an uncontroversial principle amongst the radical left, it is usually assumed to be part of a shared outlook.
While the US radical left inherits this relationship to its own government, it also has the potential to develop relationships with other popular or principled groups beyond what is implied through domestic resistance alone. We show support and solidarity for others fighting different fights, or the same fight in different places.
Regarding Libya, most of us are fine on the first point, rhetorically anyway, since that's what we are already doing, most of the time. We point out what's criminal about US foreign policy, for example, a lot. Good!
It's worth bearing in mind that what is criminal about US foreign policy is our responsibility, primarily. Libya is an example where a popular rebellion seeking to remove a dictator solicited international assistance to down the dictator's air force and other heavy military infrastructure. In the current geopolitical context, "international assistance" effectively means NATO, and NATO means the US. US interests are not Libyan interests. But none of this is the Libyans' fault, anymore than it was necessarily their fault that they needed assistance in the first place.
It's remarkable to me that portions of the US left get this backwards -- that because the rebellion required assistance, the rebels are compromised for having received the only available kind. Why weren't other kinds available? Why does the only kind available look so grim? We might look at ourselves -- at our relationship with our own government -- and not the people facing the tanks.
So on my second point, when it comes to showing solidarity toward people who not only don't control the global order but are sacrificing a lot more than most of us to change it, it's worth putting our responsibilities in perspective when compared to theirs.