Was the dentist who killed Cecil moved by seeing the animal die?

Why do some humans feel the need to inflict suffering on animals for ‘sport’? I ask myself that question yet again after reading about the dentist who paid $55,000 for the privilege of killing Zimbabwe’s oldest and best loved lion.

He shot the animal, called Cecil, with a cross bow, before beheading and skinning him.

I can understand people hunting for food, to survive, as was the norm in past centuries. The Native Americans, for example, killed buffalo to feed and clothe themselves.