self defense should absolutely be part of your preps. like most of what we do here, it's one of those "better to have it and not need it" kind of things.
being able to defend yourself unarmed is, to me anyway, greatly preferable to "upping the ante," if for no other reason than pulling a weapon automatically makes the law harder to deal with, and there's always that possibility that your assailant will take your weapon.

in addition, MA training can easily be applied to armed combat.

and the icing on the cake: MA training won't set off the metal detector at the airport.