Why did Kazakhstan want to be independent of Russia?

The Soviet Union did not treat the Kazakhs very well. Many of the Kazakhs were starving and then Gorbachev forced the resignation of Kunayev and installed a Russian. Gorbachev also made a deal to sell Kazakhstan's oil. There were riots. Other people in Moscow were upset with Gorbachev as well. Nazarbayev at first wanted to stay in the Soviet Union but later decided independence was best.