Why is it that Hu yaobang was force to resign?

Hu Yaobang was forced to resign in 1987 primarily due to his perceived liberal reforms and his sympathetic stance towards student activism, which alarmed conservative elements within the Chinese Communist Party. His support for political reform and his acknowledgment of the party's past mistakes, particularly during the Cultural Revolution, led to criticism from hardliners who viewed him as too lenient. His resignation was seen as a way to quell rising dissent and to reinforce the party's control over political discourse in China.