http://www.cnn.com/2011/US/03/12/rattlesnake.roundup/index.html
People enjoy this
Sounds like good family fun 
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"We saw this as a rite of passage to be able to bring your boys out here and let them see how you have good clean fun and learn something and appreciate nature," says Jeff Hulstein. "It's one of the ways we are going to raise these boys into men."
This species is classified as Least Concern (LC) on the IUCN Red List of Threatened Species (v3.1, 2001).[7] Species are listed as such due to their wide distribution, presumed large population, or because it is unlikely to be declining fast enough to qualify for listing in a more threatened category. The population trend is stable. Year assessed: 2007.[8]
They are also heavily collected from the wild, frequently being drawn out of their hiding places with gasoline, and used in Rattlesnake Round-Ups where they are killed for entertainment. Despite this, their population is not considered to be threatened.
I know it seems wrong. It is important to control the population. Just as we do with dear. If you noticed they we also collecting venom. This is vital to make anti-venom. Its different when you live here and those things a lerking in your back yard with your kids and dogs.
My 'rite of passage' was at 11 yoa, being forced to watch a live sheep slaughtered, something Ill never forgive nor forget. It didnt cause me to have no empathy for living things, only increased it, but I imagine watching such cruelty just for entertainment must be warping kids.
"Tomorrow I get to skin snakes and chop their heads off, and I am super-excited about it," said Laney Wallace, Miss Snake Charmer 2011.
No it is not compareable to cutting sharks fins off.
Decaptiation of many reptiles is nothing short of inhumane. If there needs to be population control then it should at least be done humanely IMHO.
"Reptilian brain metabolism can function at low respiration and heart rates, and Warwick (1986) cites evidence that the heads of snakes will respond to approach for up to 59 mins after decapitation"...
http://www.applied-ethology.org/ethicalguidelines.htm
Decapitated snake....
http://www.metacafe.com/watch/823553/decapitated_rattle_snake_still_moves/