Why do Chinese people worship Mao Zedong?

Watching the Mbappe situation, there is something I don't understand.
It's not an era of censorship and information blocking like in the past; people know everything they need to know now.
As all the facts have come to light, Mao Zedong completely ruined China's 20th century,
and on top of that, he is the one responsible for ruining even tourism revenue through the Cultural Revolution.
He is also famous as a mass murderer on the level of Hitler or Stalin.
Unlike leaders like Syngman Rhee or Park Chung-hee, who have some level of merit and are subjects of debate,
he is pure evil itself, just like Hitler.
No matter how hard I try to judge objectively, I just cannot understand why they worship him.