Stephen Yaxley-Lennon, aka Tommy Robinson, is not a martyr of free speech.
He is a convicted fraudster and former football hooligan who broke strict reporting rules which exist in court cases for a very good reason: if they are broken, that can lead to the collapse of trials of those alleged to have committed serious crimes such as rape or murder, meaning alleged rapists would walk free.
If you believe Tommy Robinson shouldn't be arrested, you are saying the law shouldn't apply to him because you agree with his obsessive anti-Muslim hatred. You also support breaking reporting rules which can collapse the trials of alleged criminals.