I agree that we do not need exotic snakes, especially huge ones, in this country. I am all for people eliminating them from everywhere except zoos.
I don't think that anacondas are a major threat to humans, but they eat beneficial species, and wreck the ecology.
Poisonous snakes are certainly a bigger threat than boas and anacondas.
One of my colleagues had a problem with some kids breaking into his home, so we cut out some pictures of dangerous snakes, boas and anacondas, and made posters that we put in his windows. Danger! Snakes! and put some issues of Reptiles magazine in sight through the windows.
There were no more break ins.