I have no experience with amateur radio. How resilient is it against bad actors? If i'd about to drown i'd probably keep yelling for help, regardless of consequ

I have no experience with amateur radio. How resilient is it against bad actors? If i'd about to drown i'd probably keep yelling for help, regardless of consequences (for others). How do you handle such cases without some authority like in centralized networks? Switch to a different frequency?