If you are as informed as you seem to be taken for, then surely you also know that within the CCP at the time of the 1989 protests, there was the side that wanted to ease the demands of of the protesters with a little return on the demands
The protesters' demands primarily being an end to corruption and - incredibly ironically - the reimposition of economic controls, the lifting of which had seen rampant inflation and spiralling living costs. Hardly any of them knew what democracy even meant - one protester interviewed by a western TV crew said he thought it meant being able to choose his own work assignment after graduation.
there was the hardliners that wanted to crush the protesters.
The hardliners had all been victimised by Red Guards during the Cultural Revolution and saw events through that lens. This was particularly so after the oaf Wu'er Kaixi told Li Pen live on national TV that he didn't know how much longer the student leadership could keep control.
If I recall correctly, June 4th wasn't the first time the PLA was ordered to use force against the protesters but was the second time. The first time was in may and the PLA didn't comply.
The PLA attempted it in May but found their convoys blockaded by Beijing citizenry. Since those troops were largely from local garrisons, there wasn't much stomach for a fight with the general populace.
By the time June rolled around, things had gotten much more desperate in the capital and an ugly undercurrent of violence lent credence to talk of a counter-revolution. The Army came in better prepared and better motivated.
So who was that ran out to the mass of student protesters urging them to go home before the brutal crackdown was to begin? Who was it?
Zhao Ziyang, General Secretary of the CCP. Here he is.
The sober-looking cove in the black suit visible over his left shoulder is Wen Jiabao.
What happened to him? You know right?
30-odd years under house arrest. Party Discipline is a right bastard.
If you want to find out more about 1989, I can't recommend highly-enough Perry & Link's
The Tiananmen Papers; and for a grass-roots view Philip Cunningham's
Tiananmen Moon: Inside the Chinese Student. Liu appears as a minor functionary rather than a prime mover of the student movement.