Responding to trespassing tends to grant a fair bit of leeway on property damage and personal injury.
It's still not clear that the FAA is even allowed to consider a drone to be an aircraft, and therefor under their regulatory purview, as this contradicts other parts of the same regulation. AMA is playing it safe and telling all us hobby pilots to register our UAS, but the legality of what has happened is still contested. (perhaps mainly by armchair layers). I think without settling the matter in court and establishing a ruling, we won't really know for certain. If you haven't guessed, I'm in the camp that does not consider hobby RC UAS to be aircraft. (which is true)
Also, I have to point out that flying FPV is still legal. But as most people interpret the regulations it's limited to hobbyists, things get complicated if FPV were to become a competitive televised sport and people start having sponsors. (likely violates FAA at that point)