Terrifying or lovely?

In a conversation with a friend, suddenly appear the subject "Sharks", and because of that, I decided to post here about it. Like always, I like to oppose, and now I'm going to defend that sharks, which beyond being the "bad guys" are so sweet and lovely that is a desire bring them home! Like nobody likes them, I feel myself in the obligation of defend this animals, because they're irrationals.

And my question is: Why are they attacking people?
The only answer that I found is that they attack people because is missing something in their habitats, and that could be human being fault. An environmental problem sometimes caused by Man and other times by own nature.

So... if you're relaxing in the deep blue ocean and suddenly be "bitten" by a shark, think about what you do every day to disturb their home!

Some of you have fear.
Me... I have respect!