Has Assad deliberately destabilized other countries, infiltrated their governments, spied on their people, interfered with their internal affairs, bombed innocent people without a declaration of war?
Why, yes he had. Or perhaps you were not paying attention to what has been going on in Lebanon and Jordan over the last few years. Jordan has remained stable and most of the damage in Lebanon was done by Assad's father, but that does not change the fact that Assad has interfered with their internal affairs.
"Hey, I'm going over to Syria to kill westerners and enslave Christians for the raping and whatnot...but my car broke down Ms Librarian. Do you have a book on automotive repair?"
The laws were written to hold you responsible for helping if you provided the book and there is a reasonable argument that they should. On the other hand, if they just ask for the book without mentioning what they plan on doing as soon as the car is fixed means that you cannot be held responsible for their intentions. In addition, if you can make a believable case that you did not believe them when they said they were going to Syria to kill westerners, etc, you are also off the hook. Or if you can make the case that if you can't afford a mechanic to fix your car, you can't afford a ticket to get to Syria either. If you can reasonably see no connection between the aid they are seeking and their criminal goals, you cannot be held responsible for providing that aid.
Personally, as a long-time reader of Archaeology magazine and enthusiastic amateur in the field, what I keep being surprised by is the field's routine assumptions that people before us were somehow stupid.
It derives from the "progressive" view that is taught so thoroughly in most schools (especially colleges and universities) that "new" means "better" and that history is irrevocably moving from worse to better.
For God's sake, stop researching for a while and begin to think!