Further to, a much more recent example - R v. Bilodeau. Father and teen son pursuing suspected thieves, contact adult son to come help and bring gun "just in case". They claim the intent of possession to use the gun only if they needed to for self defence, but as per Kerr:
[27] Unfortunately, the instruction on this point was “decanted” to the point of inaccuracy. It restricted “dangerous purpose” to “the dangerous purpose of committing an assault”, but a dangerous purpose can be something other than an assault. Perhaps more significantly, the instruction that the Crown had to disprove an “innocent purpose of protection” was too narrow.
That is because the trial judge did not leave for the jury a third option (which would have been favourable to the Crown) that possession of the rifle for a “protective purpose” may still have been objectively dangerous to the public. Possession of a weapon for protection can constitute unlawful possession for a dangerous purpose where the perceived attack is avoidable: Kerr at paras
38 (per Major and Bastarache JJ) and 94 (per Arbour and LeBel JJ). It should have been open to the jury to consider whether the confrontation at the intersection was avoidable – for example, by breaking off the chase and returning home.
Both the father and adult son were convicted under section 88, as it was found that self defence didn't apply to their purpose of possession since the threat/ conflict was avoidable.