Regardless of your opinion on the motives of the rioters, their 'tactics', the actions of the thousands of others who followed in their wake, and the geography involved (the riots covered over 32 miles in an area with several million residents) set the stage for a government response that included military forces. This was not the case in Tiananmen square where the demonstrators were a)peaceful and b)located in a relatively small area.
Your comparison shames the bravery of the '89 demonstrators, while at the same time drastically minimizing the horror of the response (both that day and after) by the Chinese military.