Your examples illustrate my point quite well. It is (and should be) illegal to pour greek fire on even 1 person - small scale doesn't make the action ok.
Does this mean we should pass a law against salesmen, and just general interpersonal persuasion? If not, why not?
I'm going to try to put my finger on the nature of your comments that's troubled me for quite some time.
A key element that's lacking seems to be the principle of charity: seeking a sympathetic understanding of an idea presented, and interpretation of ideas in their most persuasive form.
I don't believe I've ever seen you do that. You might care to give it a thought.
How is Greek Fire unlike a hydrogen bomb? How might considerations of these be different? What else that shares elements of what a hydrogen bomb is, or does, still substantively different in a way that would not require some sort of regulatory treatment?
Why is it we pass laws, generally? What are the hallmarks of a good, or a bad law?
If I sell you something I know you have the money for, but can't afford, that's a predatory action.
If I convince you to harm yourself, that's a predatory action.
We have laws of various forms making these actions illegal. They may not be federally regulated, but could probably stand to be, especially when it's done at scale.
Who needs protection of the law in those situations? The emotionally exploitable or the unethical salesman?
Does this mean we should pass a law against salesmen, and just general interpersonal persuasion? If not, why not?