Yes you are right nothing illegal was done and it was probably his right to make a statement and then leave. But if you are really trying to help others, this is a one time pop. Then all the negativity is heaped upon your motives and actions, so who benefits? The person creating the disturbance might of gotten something out of it but the rest are left in bewilderment and disgust.
The availability and effectiveness to be able to reason with a person with hints and questions about there faith, now that's what the GB fears because its effective. Posting on the internet is effective its where it all happened for me. Commenting on a Facebook or Instagram post about the best life ever hashtag, that's where you give them a gem to ponder, "Effective". I read stuff on amazon reviews of all places and left thinking about what was said, "Effective." Creating a disturbance at a peaceful gathering only makes you look disturbed. Creative but not effective.