Inciting a stampede or riot isn't a protected act, anywhere. If you do something with the intent to get that result, you are responsible for that result even if the victim was stupid for responding like that.
Continuing in the vein of the hypothetical ...
It is extremely difficult to prove
intent, which is an internal mental construct, if that's what is necessary to determine "guilt".
On the other hand, proximate and/or ultimate cause* is a more achievable possibility, but limited to that culpability is reduced.
(* For example,
proximate cause of someone's rear bumper being crunched is my vehicle's having hit it; the
ultimate cause might be the failure of my vehicle's braking system or my inattentiveness. In either case, albeit otherwise irrelevant to the main issue, the matter is dealt with by liability insurance.)
