The difference between breaking into a house and hacking into a machine is that a burglar can only break into so many houses and has a significant risk of getting caught. A hacker can get into an almost unlimited number of machines and is unlikely to risk any retaliation.

As a result you have the equivalent of dozens of people trying to pick the lock of your door every day, and the law can't do much to stop it. That requires you to pay f*ing attention to the quality of your lock.