Do you have a source for this?
The absolute numbers are meaningless - many more people committed crimes in the trouble over the Southport tragedy. What is more pertinent is how many people were found guilty of crimes and not imprisoned, or given short enough sentences that they are released now.
it truly would be outrageous if men convicted of rape were given shorter or suspended sentences than someone convicted of incitement to racial hatred and violence - but as rape has a minimum sentence of 4 years, and incitement to racial hatred starts at 3 years, that wouldn’t be likely.
As has been pointed out plenty of times already, there is no such thing as freedom of speech without consequences.
We have rights to freedom of expression - ironically (as I get most of those whining on about fReeDOm are brexiteers), this is given through the European human rights act.
But as with most things, our personal rights are restricted where they impinge on the safety or personal rights of others.
TLDR: you can’t shout fire in a crowded theatre