The scope of certain offences is very broad. This is true of manslaughter and or criminal negligence causing death. You may have noticed that these two offences were not included in Bill C-10, for example. The same model was more or less followed in terms of selecting offences with a limited scope.
It should also be noted that the reverse onus scheme applies in the case of a person who has been ordered by the court not to be in possession of weapons. Therefore, if such a person were to commit an offence with a firearm, the reverse onus provision would apply. Consequently, up to a point, this is included, but not from the outset, as is the case with the eight other offences.