What's the end game with policing speech? You're clearly not going to change people's minds by arresting them, and will in fact make people more resentful of groups they can't even criticize, so social cohesion isn't the reason.
UK never actually had freedom of speech, but they were able to speak pretty freely a few years ago, and now they have well over 3500 people/year arrested for "offensive" online comments, knife crime rose 22%, gun crime up 11%, rape gangs, the NHS has decreased in quality and its cost, both in total and as percentage of GDP, has been on a steep incline for the last 20 years. What direction do they think they're taking the country?