The stuff you posted includes what is basically NATO propaganda, which is why it got so much reactions (and admittedly not all of them constructive - again, no downvotes here). Don't take my word for it, take the CIA's word for it for example (or any number of a hundred - far better argued and sourced than mine - answers in the very thread you linked). The "Tiananmen Square massacre" as usually described in Western sources is not something that actually occurred.