"I am not among those who fear the people. They and not the rich, are our dependence for continued freedom." -- Thomas Jefferson, 1816 "[F]acts are before ideas." -- Mikhail Bakunin, 1882
Freedom of speech is not freedom from criticism.
Put the elements of the case together and see what you come up with.
You might be right if the beheading was by itself, which is an extremely rare way to kill somebody.
Then add the recent conversion to Islam.
Then add his rejection by his co-workers of Islam.
Then add his attack on 2 women.
What does that all add up to?
Any of those elements alone don't mean much, but together paints a picture.