Although the animals that we admire and dislike will vary a lot from person to person, there tends to be a pretty strong consensus on which ones we're impressed by.
After all, most of us know that messing around with a tiger, a bear, or a venomous snake is a seriously bad idea, but it's hard not to feel that way when we come across any particularly big example of a creature.
Huntsman spiders, for instance, aren't known to be particularly aggressive or harmful to humans. Good luck convincing someone of that after they see one for the first time, though.
That might also be true in the case of the coconut crab, but you might be surprised how pleasant one can be to look at in the right context.