The wiki summary is if one lets intolerant people rise to power, they use their power to implement intolerant policies, eliminating the ability of the tolerant to change things back.
One always has to worry even in a democracy, for instance here one party manipulated the voting system so even though they only got 49 percent of the votes in the election, they got 60% of the representation in the state legislature.
https://www.nytimes.com/2017/09/06/us/politics/prominent-rep...
You can take the absolutist free speech argument that some in the US make from the first amendment (you write later down that English is not your native language) but Germany seems to be going OK banning Nazi speech/symbols.
One always has to worry even in a democracy, for instance here one party manipulated the voting system so even though they only got 49 percent of the votes in the election, they got 60% of the representation in the state legislature. https://www.nytimes.com/2017/09/06/us/politics/prominent-rep...
You can take the absolutist free speech argument that some in the US make from the first amendment (you write later down that English is not your native language) but Germany seems to be going OK banning Nazi speech/symbols.