so it would need to be a stature or law that specifically forbade me from pouring vinegar over a weed in my garden...
No, it wouldn't. Assuming you mean statute. No idea what stature is in this context.
Fantastic! I get to come over all pedantic, like ban-all-sheds
You are correct, of course. Let me post exactly the same question, but with better spelling; So, when you accused people of acting illegally, can you please let us know which statute or law they were personally breaking?
Do bear in mind that, as this is a DIY forum, then my question relates to what individuals do in their own gardens.