Criminal sociopaths? Really? Because of what one vet charged you? I am sorry this one vet charged you so much for this euthanasia but painting them all with such a wide brush is unfair at best.
Vets are medical doctors who make a fraction of the money physicians make.
Honestly this kind of...
The real cost of these are the education, expertise and licensing to be able to purchase and administer this stuff. Not to mention the clinic overhead.