[themusicgod1]

You're presupposing here that "hate speech" is what needs remedying. You already have a conclusion you want the rest of us to reach about what we should be saying. More speech is not a remedy to 'hate speech', but it is an alternative to physical conflict. Some conflicts have been going on for thousands of years and you should not expect that they will be over within a brief period. Hatred runs deep and if you repress it, it will not go away.

Censored environments like Reddit don't have the least hate because they aren't encouraging it, but because they are incapable of being used for communication between parts of humanity that exist, and will continue to exist for the time being. They are as a sandbox/playpen is to a real social environment - somewhere for children to learn and play around, but not much more. The bigger questions, disagreements and problems we face as a world are going to involve hatred and conflict before they are resolved.

[surge]

Free speech is a pressure release valve for society. Otherwise, people just keep quiet until they explode, many times in a mob because they feel no one is listening or they're being suppressed, or ignored by media, politicians, etc. For example, it is far better someone goes and complains about immigrants online and vent frustrations, even if half of what they say is racist or unjustified, because they at least are venting frustration non-violently and maybe, just maybe some of their concerns or points or personal experiences are legitimate and need to be addressed even if it's not with the solution they're suggesting. If nothing else, you know that person exists, and they're on your radar if they start expressing violent intentions.

Also, the answer isn't to suppress speech so it goes and hides under the surface, it doesn't go away and the people exposed to it never hear the counter points. The communities you talk about, like reddit, hate speech gets downvoted, it gets counter argued. Bring dumb hateful ignorant views into the light, so they can be addressed, if not for the purpose of convincing the OP (which is often futile), convincing anyone who might be on the fence or sympathetic at least partially to some of their points can understand why its wrong. The problem is when boards or sub-reddits become insular so never face opposing views, on either side, going back into bubbles or group think does not lead to moderate opinions and compromises, just like proving someone wrong can sometimes just cause them to double down on their opinion.