you're not arguing about freedom of speech here
what you are arguing about is the freedom to breach socially accepted norms of behaviour without retribution.
In effect, the freedom to insult someone without getting a punch in the face.
If you want to use TOR or an anonymous VPN, go on, do it. See how far it gets you. Just be aware that traps can be laid quite easily: a link in a PM, a webbug in a private message........
And of course even if you manage to avoid these catches, don't forget that anonymous VPNs usually hold records and can be hacked......or subject to court action
Or the minute you hook into a filesharing program, then TOR or the VPN is bypassed
Or that e-mail address you used when you set up the PPRUNE (or whatever) account........did you make sure you were using TOR when you created that? Have you used TOR every time you logged into it? What name / address did you give when you created it? Did you use the same password as on your other e-mail accounts (the authorities can scan e-mail accounts to find those with the same password and so link users.......)
If you think you're anonymous, then you are a fool.
If you ever think you are safe from interception on the internet, then you are an idiot