This is recklessly negligent and I would personally not tolerate a coworker or report doing it. What's next, sending long-lived access tokens out over email and asking pretty please for nobody to cc/forward?
Standard rule is you never let your developers at the production instance. So I can't see why an LLM would get a break.
Thats stretching the definition of 'research', it basically checks if the texts are close enough.
Delete can occur in various contexts, including safe contexts. It simply checks if a close enough match is available and executes. It doesn't know if what it is doing is safe.
Unfortunately a wide variety of such unsafe behaviours can show up. I'd even say for someone that does things without understanding them. Any write operation of any kind can be deemed unsafe.