The thing is, that wasn't some mainstream thing. Some far right wing politicians will try to make it look better than it was, but as long as it is not illegal, let the fools make more of a fool themselves. People tend to avoid extremes, so if they can constantly see what other people see, they will react to more of that by avoiding such nuts.
When you start censoring such on one side, and do not do so on the other side, which says left extreme things, the natural behavior of those undecided will be to move away to the right, while not seeing the full scope of risks there.
And by silencing them, you will start sparking emotions, which then lead to conspiracies and radicalization.
In the past, there is a reason why pre-elections, a couple more mouthy politicians with crazy talk were being hidden by their own party as the nonesense they spew was too much and while entrentching own radical side of supporters, it made more centrists people afraid to vote such.
Seems that these days you are viewed as either an alt-right nutcrack, or sj-lefty dumbass.
In truth, both sides should tolerate others existence and right to express views, even if some of them are radical. Usually that leads to some compromised middleground being followed while you have dogs barking from the both extremes.