That is what happened in 1989.6.4: There is really no reason to send the troops in by June 3 because 95% or more people have left TianAnMen Square. Simply waiting for another 2 weeks, and the students would be gone from TianAnMen Square. But the problem is, the People's Congress planned to have a special meeting about 罢免李鹏. If that meeting took place, there is a high chance that Li Peng will be fired. So they killed the demonstrators, and more importantly, killed that meeting.
