Ask 100 people what is evil and I'm sure you will get similar number of different answers. Is abortion evil? Is religion evil? Is being proud of your history and heritage evil? Is being gay evil? Not everything in life is black and white. In fact, most of things are grey, so it's important to allow both (or even more) sides to express their views, even if somebody else might find it evil. If it goes down to threatening with violence, outright racist slurs etc. we have laws to deal with it.