Whether it's seals or bulls or sharks or chickens or cows, I think the main point is, "People are cruel". I guess that's the problem with being so evolved as a species, some of us use it to take advantage of the weaker species for our own benefit while some use it to feel sorry for those of whom the cruel ones take advantage.
The world is way too fucked up to worry about the seals. Let's worry about people killing people first, then let's worry about the cute animals. Then, when that's all done, we'll move on to the ugly animals, THEN, if there's time, we'll stop killing the insects too. THEN, when that's all done, we'll stop walking around for fear of killing an ant and we'll stop breathing for fear of stealing the air from some other living thing that is just as deserving. Then, when we're all dead, the circle will start over and cruelest species will dominate once again until, of course, they start feeling bad about it.