If you censor all opposing arguments, all you need to do to convince the vast majority of people of most things is too keep repeating yourself until people forget that there ever were opposing arguments.

In this world you can get people censored for slandering beef, or for supporting the outcome of a Supreme Court case. Then pay people to sing your message over and over again in as many different voices as can be recruited. Done.

edit: I left out "offer your most effective enemies no-show jobs, and if they turn them down, accuse them of being pedophiles."