That’s not what the science says btw. If you go to Russia and ask old people about how they feel about the USSR, they are significantly more likely to have favourable views of the USSR than young people who didn’t experience it. If you are interested, you can also look at Generational and Geographic Effects on Collective Memory of the USSR.
It actually matters where people died because in the square there were unarmed student protesters and outside the square were armed workers battling it out with military which resulted in an almost even split in casualties between workers and military. A massacre entails armed people rounding up unarmed people and just straight up slaughtering people.