Unless you have a specific military goal in mind, such as interdicting
enemy shipping, and don't know the id's of all of your foes. Then, you
use hostile all to make sure you don't miss any, and warn neutrals to
contact you, stay away, or suffer the consequences. If Olympia had a
way to board and check for contriband then this wouldn't be necessary,
but unfortunately it doesn't.
I just don't get what the problem here is. If the Borg are doing
something you don't like, you can attack them to make them stop. Or you
can avoid them by going somewhere else. But pontificating about it
seems to be perhaps the least effective strategy.
Rob