The caption to image #5 would be considered unacceptable in a photojournalistic context. You can report facts, such as what he said (as long as you get it correct) but not your opinion about him being 'unbelievably stupid'.
The information that he is protesting against China, but not waving a flag makes an interesting counterpoint to your caption to the second photo: " Hundreds Chinese one Tibetan protester at London Bridge'. That isn't a fact that you could know, and it isn't corroborated by what we can see in the photo itself.
Best,
Helen