Yeah, it does mean crime becomes carte blanche to do against criminals of a certain caliber. But that's the consequence of deciding to live one's life outside the law.
If the crimes discussed on the phone are trivia in relation to rape (e.g. shop lifting, drug use) I highly doubt the police would bother prosecuting those crimes. How many minors who were raped while.drunk got charged with consu ing alcohol underage? I don't know of any, and the outrage over doing so would be immense.
Could this serve as an incentive for less crime?
Frivolity aside, "raping criminals" doesn't seem a very viable endeavor. They are, you know, criminals to begin with, and they, or their criminal friends, can perhaps do your head in...
(Plus, blackmailing a criminal with evidence of their crime, sometimes for sex too, has happened since time immemorial - even between corrupt policemen and criminals-, it's not something uniquely enabled by mobile phones).
Was this sarcasm, or are you actually suggesting that criminals should fear extrajudicial "justice" of having crimes committed against them and being unable to report them?