Of course, there were a few who were against it, and some of them stayed neutral. The heroes present in the conference room were the strongest heroes in the country and they held the power to influence the people.
Still, it wasn't as though the strongest hero of the country had the most fan following. There were a few heroes who were in the top 20 but had more following. Nonetheless, the female heroes had more following than the male heroes— for obvious reasons.
After watching the full video and understanding the points the three founders of the hero organization were trying to make, even Rudy felt like choosing the side of the hero organization was an obvious choice.
It was a simple logic; a farmer would know how to farm rather than a technician.