By 1991, they weren't murdering nearly enough of them to keep the system going. There are probably few who remember the purges, and no one who rememebers the famine.
Don't kid yourself. There are plenty who still do. They also remember how Stalin dynamited so many of their churches, including the church of St. Mikhail in Kiev. Mikhail is the patron saint of Kiev and Ukraine.
Russians are not the favorite flavor of the month over there.