Social cohesion and trust could be one pressure that deters you from doing so, as you would lose trust from any other self-respecting citizen that would recognize you as a thief/threat based on our interaction.so whats stopping me from taking your stuff you bought at the free market
Laws that recognize property rights are also a consideration though I'm no expert in this regard at all. Side note: Interestingly in the phrase, "Life, liberty and the pursuit of happiness" - apparently "happiness" was substituted for property by Thomas Jefferson in the US Declaration of Independence as one of the three unalienable rights. -
Also, if you drive dangerously then surely you lose the moral authority to condemn dangerous driving. If you condone theft (and by committing it you condone it), surely you lose the moral authority to condemn theft against you (And those you love). So do unto others... I guess?
Also by being malevolent you're surely just encouraging a dangerous environment for yourself and your loved ones as you've condoned malevolence itself.
Ultimately nothing is stopping malevolence though. Even God, if you're so inclined, allows it until judgement day. There is an idea about the benevolent view of the universe, as it enables life (and the link thereof), but I wouldn't be able to expand on this idea without more study on my part. There is also Universally Preferable Behavior as an argument, but few people seem to have respect for the character that proposed it and there are many critics.