because the line of reasoning you are using has been repeated over and over and over.... but it's not exactly working out well. Words have a lot of power, and we already limit what people can say through libel laws. Much of the hate speech going on is really just libel to a group of people. No one really wants to police speech, but we already know untruths targeted at individuals can be devstating and we have created laws in most countries around that. It hasn't resulted in mass censorship of "YOUR ideas, and YOUR opinions" unless they are untrue ideas about other people that you think you can put out into the public space. America has this as their corporate slogan "Life, Liberty and the pursuit of Happiness". Liberty cannot outweigh Life and pursuit of happiness. You need to balance all 3 of those, in fact, without rules everyones liberties are reduced.
We don't allow people to drive anyway they like on the roads, we have basic set of rules that allow everyone a lot more freedom to go where they want, violation of those rules tends to cause harm, and if it was total "freedom" then it would be chaos. If we cannot work out what those are for speech( and we already have some )so that everyone gets more effective freedoms, then more harm will keep happening.
