Slate put up a great article today talking about the psychology of less-than-lethal force when you're in the position of law enforcement officers. It's not that they are particularly evil for using things like tasers and pepper spray, it's that they are human. And humans are lazy.
The part that really jumps out to me, is that the data backs up the psychology. Introducing less than lethal force options actually correlates directly with a rise in in the rate of violent encounters during an arrest.
Not to mention the fact that people can and do die from being pepper sprayed or tasered. Less-than-lethal is a bit of a misnomer.
I just hope they don't come out with shellfish spray or I'm totally screwed.