All they ask me at the border is why I am visiting Canada, for how long, do I have any firearms in the car????
To have known about “hate speech” on an IPad meant the guy arrested was on some list, under investigation by “hate crimes” police in Canada.
The Canadians may have been working with US authorities like the FBI or organizations that affiliated themselves with the Obama Justice Department like Southern Poverty Law Center (has that mess been cleaned up yet?).
I think buckalfa found the reason; per his post:
“...the arrest seems to have been for a protest without a permit after having been denied to speak at an event based on his prior public statements. ...”