These fish are hated and despised in the USA, they have as little regard for them as we have for maggots.
However, we all know that Americans are little more than overgrown schoolchildren (sic) so rather than bitch and moan they get out there and have a bit of fun with them.
It strikes me as a bit hypocritical that a forum which, generally speaking, advocates a cull of invasive species in our own country (cormorants, signal crays, mitten crabs, et al) and even suggests that otters should be removed should complain when another country chooses to desanctify one of their alien species in the way only north Americans can.
The problem comes from our unnatural over protective attitude for anything which has 'carp' as part of it's given name.