One thing to keep in mind is that the best defense in camp is too heavy to be taken along while out hunting (unless you're hunting bear, of course), hiking, fishing, etc.
In camp, I keep handy a Winchester 1300 with seven slugs in the magazine and five more attached to the receiver. Personally, I would rather face a bear with that than with pepper spray.
Out on the trail, though, or out in the trout stream, who can lug around a cannon? Here, I think, is where a can of pepper makes the most sense.
And save the knife for knife stuff.
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I don't want my children fed or clothed by the state, but I would prefer THAT to their being educated by the state.