Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Fairly recently my sister and here friends went out for a bit and I thought nothing of it as you would normally.

About an hour and a half later my sister comes into my room sobbing saying there was a police car (uk) 

I asked her what happened and apparently they thought it would be funny to break down a door that seemed like it led to an abandoned house which turned out to be a small factory still being used (after hours) and the alarms went off so they legged it

I thought the best thing to do was tell the police car there due to the fact that one of her friends had just stood by telling them not to go in

A whole bunch of stuff happened and she got away with it because of a first offence underage yet nowadays I get called a snitch

Am I the asshole?

snitching in my sister