Why did the reformer Deng Xiaoping support the suppression of the student movement?

A reformer is a representative of the highest power in a country who is afraid of losing this power. It is known that he was personally involved in the brutal suppression of student unrest. The introduction of soldiers and armored vehicles, the death of many people in clashes with the army, mass arrests and executions of activists subsequently, the introduction of censorship – all this is the work of Deng Xiaoping.The goal of all these actions is to preserve personal power, the nomenclature of the Chinese Communist Party and the usual ideology. This is how all the rulers usually do with their subjects. They do not tolerate protests.