Freighters will be built to carry cargo the most efficiently as possible. Ships on well traveled routes will not carry armaments. The 100k freighter will not be armed since it will never serve a route that has pirates on it. Having all those gunners is just a cost a merchant won't pay if they can avoid it. And that big of a ship simply won't serve small worlds that have pirates picking at it.
There is always a small chance, but keep in mind a ship with that much cargo will arrive with dry tanks, so you can't run away with it. And a system that can support that big of a ship will have police forces to protect it or keep it too hairy for pirates in the first place.
I'd have to look at the crewing rules more closely, but there is really no reason to have that large of a crew. Maintenance will be performed at a port. Most of the space is set aside for cargo or fuel. Crew should top out around fifty max. If we can have ships of huge size today with small crews then the future should be able to replicate this.
There is always a small chance, but keep in mind a ship with that much cargo will arrive with dry tanks, so you can't run away with it. And a system that can support that big of a ship will have police forces to protect it or keep it too hairy for pirates in the first place.
I'd have to look at the crewing rules more closely, but there is really no reason to have that large of a crew. Maintenance will be performed at a port. Most of the space is set aside for cargo or fuel. Crew should top out around fifty max. If we can have ships of huge size today with small crews then the future should be able to replicate this.