Yeah, but the other option is humanity grows to reach an industrial carrying capacity which would be horrific for the environment, and people. The average person would live at the poverty level of a medieval peasant in the polluted environment of industrial slums. There would also be mass famines every couple decades like back under the agricultural carrying capacity, but these would kill billions instead of hundreds of thousands. Mandatory birth control sucks but it beats the suffering caused by rampant population growth.
You could argue the opposite, genocide would be guiding reproduction away from diversity.