> If they are such obvious lies then people will figure it out on their own - why do we need to censor them?
Enough people will be fooled, which is why they spread the lies. They're not stupid.
You're also kind of twisting the GP's meaning. He's not saying the lies are obvious on their face, but they're discoverable by a layman from critically comparing sources. However a lot of layman (most?) don't compare sources.
This is reasonable to ask because Western sources have (also) been lying a lot, e.g. presenting photos taken last year as the Ukrainian president fighting on the front line today. So we have two lying groups and no obvious ways to figure out what's true. Occasionally you get lucky and e.g. reverse image search saves the day, but mostly, there's no way to detect lies.
RT and its friends have a pretty well documented history of deliberately and strategically spreading lies and disinformation (e.g. when MH17 was shot down, they sprung into action spreading all kinds of lies and conspiracy theories to obscure the Russian involvement). Western sources may get things wrong from time to time, but they're at least trying to get things right.