I doubt they were as happy as you might think.
The populace was completely brainwashed (no pun intended). Mother Brain was all they knew. It was quite the Orwellian society.
It's the same thing that happens in places like North Korea: the people could revolt, but they don't want to. Rolf was probably hated, not loved, especially since there was almost certainly a ton of propaganda calling him the enemy of the people and stuff like that after the Climatrol incident.
Besides that, they suddenly had to work and no longer were given rations by the government. There was a lot of uncertainty. People don't like that.