It's the opposite. The negativity of the picture comes from wild associations.
Tanks breaking for a civilian and soldiers not reacting with violence is in itself good.
Tankman was a huge propaganda win for the west. However upholding it in times of wikipedia is silly if the tanks were leaving. The man is not trying to prevent students from being crushed. What's the message now?
To clarify, I don't think that killing the protesters on the square was acceptable.