The reaction to this showed the exact opposite is true. Some repellent ideas actually thrive when suppressed but die in sunlight.
Arguably this is true of most repellent ideas. E.g in the UK support for the BNP rose while the media blackballed Nick Griffin but collapsed when he was allowed on Question Time. In Sweden the Sweden Democrats are
blackballed but doing pretty well. The Front Nationale in France is heavily suppressed with hate speech laws and blackballed by political parties but, like the SD, polls well. It's not impossible that the SD and FN will eventually form a government. The SD might turn out to be OK, but the FN
have some real crazies as MEPs.
The US doesn't really have any viable parties to the right of the Republicans or to the left of the Democrats, probably because it doesn't restrict political speech. E.g. the KKK has First Amendment protections which means anything but incitement to imminent lawless action is allowed. France, Sweden and increasingly the UK have hard core restrictions on 'hate speech'. Even though the Griffin was allowed on QT there were
protests against it by the far left and it's hard to see the current BBC 'far right' figures on again. And they'll define 'far right' as anyone who is not far left.
YMMV on whether the BNP, SD and FN are 'repellent' of course but it's hard to argue that they are to the right of the mainstream conservatism.
Plausibly coverage of extremist parties like the BNP makes voters reconsider voting for them and instead voting for a more mainstream party, e.g. the Conservatives or UKIP, that are sceptical of mass migration without being ethnonationalists. Of course the far leftists who work at the BBC probably don't see it that way. To them Conservative=UKIP=BNP=Nazis. However I think it's fair to say this sort of attitude will backfire on them.
If they wanted to suppress support for the far right, the best approach would be to give them as much airtime as possible. Of course that would probably increase support for the Conservatives and UKIP which is something they greatly fear.
If they were a bit more rational about this, they'd try to redirect support from the BNP to non ethnonationalist parties by giving politicians from all parties a chance to speak. As it is they'll probably put out inept left wing propaganda and all non mainstream parties will benefit, some of them benign and some
deeply dangerous.
Oh yeah. That video exposing the BNP/KKK ties and plans to use control of the media to get people to say 'every last one must go' has been flagged by Youtube.
Dumb fucks.