From the Article from the Org. which works for Freedom of belief,
"Our goal remains to prevent hate crimes starting with countering hate speech through correct information and objective knowledge of the phenomenon."
I agree with that worthy aim, and obviously violent acts are always wrong, nothing good comes from Violence, nothing ever could.
All Countries need to have Laws which heavily punish the publication of Hate Speech.
Freedom of Speech should never allow that. The CEO's etc. of any Platform that publishes Hate Speech, as well as individuals, should face huge Fines and possible Imprisonment.
But it may be revealing to find out the motivation of the perpetrator, or perhaps not, some people just go slightly crazy when Hate Speech gets through to their tiny minds.