Lol, so a locked door inside a garage where they have all the time in the world to do as they please without fear of being seen by neighbours, passing cars etc, is gonna prevent them from getting any further? Also they aren't just stealing openers the new vehicle have it built in you pair you on board unit to your garage doors RF code (much like how your shaw or Telus remote can control your tv) and they are using RF ID readers (25 bucks online) to read the code emitted when it's transmits... A lot of them aren't even breaking into cars now they simply sit in a residential area in the morning waiting for people to leave and close the overhead door behind them at which point they read the code transmitted and have full access to it anytime they please. Nothing will stop them if they truly want in but detecting them when they do (alarm system) is key.