As someone who spent months in the Canadian High Arctic doing climate change research... we carried shot guns with us at all times, because of polar bears. Thankfully we never saw a polar bar, but if we did and we could not get to our skidoo in time, we would have had to shoot one too. This is a sad story, but polar bears hunt people and if its coming after you... you have to shoot it. Sure we were in its territory, but that doesn't mean we deserve to be eaten lol, be reasonable.
I will say that I am not a huge fan of these kind of Arctic tours, but I do think its good for people to experience the Arctic and this is rare occurrence.