“Is there any end to it?” - Probably not - moral standards are constantly changing. 

In my relatively short life time I have seen massive changes in standards and opinions from making homosexuality legal to changes in animal welfare and attitudes towards racial, religious and sexual bigotry and the ending of the death penalty. 

What we have to be aware of though is that not all changes are necessarily for the common good despite being supported by a majority.  You only have to look at Germany in the thirties and how propaganda and political manipulation changed the general attitude towards the Jews and made statutory changes acceptable to the majority.

Personally I’d have no problem with the outlawing of horse and dog racing, show jumping and even snail racing but I accept that I am probably in a minority regarding those and have to accept societies moral judgement of them.  That doesn’t mean I shouldn’t be able to speak up against them and encourage others to do so.  

If we try to repress the minority from expressing their moral stance then there is nothing to stop extreme views from becoming, or remaining, the majority opinion.