Hackers and
Crackers.
There is a substantial difference between the two.
I wish "Hacker" still meant what it did back when.
Back 'then' it meant someone who fooled around with hard/software to make it better.
Unfortunately, that meaning no longer applies.
Now the term 'Cracker' is the same now as then, these are the best of the worst. They don't find script to use, or mod an existing script. They write script, and crack into systems that would scare the crap out of the SK's. Most , hell, nearly <all, home computers are not secure enough to keep them out.
If someone has physical access to your system, there's very few security measures that can stand up to anyone with good skills and bad intent.