Why might Deng have been successful at crushing dissent when so many Eastern European leaders had failed?

Deng Xiaoping has rendered outstanding service so he was probably never in any doubt because he did wat other European leaders couldn't.

Explanation:

Deng was probably never in any doubt that the movement had to be crushed, and he deplored his lieutenants'.

Deng effusively praised the PLA and condemned the protesters-most of ... policies that he initiated-especially those of an economic nature-with great success.

Deng Xiaoping has rendered outstanding service to the Chinese people, throughout the revolution, during the development of the People's Republic and especially in recent years when, after the disastrous "cultural revolution", he succeeded in setting the country on the road to socialist modernization