Fascists don't need any "martyr", even leaving aside the fact that nothing being done to Andrew Tate here is worthy of that label, because fascists are perfectly capable of fabricating a strong sense of victimhood in their own heads. The antidote to fascism is overwhelming opposition, not appeasement.
They don't respond to truth, civility, or compromise - though they may on occasion weaponize such ideas when it serves their own ends - because they don't believe in either of those things. This is just liberal brainrot. It didn't work in the Weimar republic and it certainly isn't working in the USA.
In truth, not banning people like this from society just teaches others that their sick ideas must have some sort of validity to them. Otherwise, why would it be on display?