i remember the panic about the africanized honey bees taking over the country. that was a long time ago.
fire ants are much worse. if someone felt they had to be destructive they could learn how to disrupt those and go south to start fighting them back. i've also heard about crazy ants being a challenge. ants are tough customers to eradicate but it can be done with a very concerted/coordinated effort.
the invasive hornets, yes, it would be good if you could fight them back now before they really get established and spread even further. some really dedicated people could make a lot of difference now while it is still early.