The question Is it true that Canada doesn't stamp foreign passports by default? currently has three 'answers' that are only anecdotes about one-time incidents:
...I recently drove into Canada and I got a stamp in my passport...
...Just arrived in Canada yesterday... My passport was not stamped...
...I have not had my passport stamped...
These do not prove a thing either way. We are dealing with too many variables (people) to conclude anything from one incident.
What do we do with these answers?
Downvote and leave a comment? What comment so that it does not sound too rude?