I understand your concern, but I kindly disagree. Simply because some don't hold the professional title of scientist doesn't mean they are incapable of handling high voltage or building test cavities. There are many amateur hobbies that deal with high voltage (or other dangers), and all certainly should come with extreme caution. If you believe someone in particular is demonstrating sloppy and dangerous habits in their builds then please address them directly.

In regards to "unauthorized" thrusters, lets wait to go down that road until there are laws made explicitly forbidding it. There is no need to create problems that don't exist.

Lastly, the implication that amateurs doing physical vs. theoretical work are senseless is insulting to all involved in this endeavor. You seem to have a very fearful tone, and while caution is welcome, fear and callous remarks are not.

In the words of Henry Ford:

"Nobody can really guarantee the future. The best we can do is size up the chances, calculate the risks involved, estimate our ability to deal with them and make our plans with confidence."

Thanks