In the 70s, 80s, there are few computers and few people know what to do with computers and the Internet. It was fine. But today's hacking (or cracking) is drive

In the 70s, 80s, there are few computers and few people know what to do with computers and the Internet. It was fine. But today's hacking (or cracking) is driven primarily by the black market. So you can't just let anyone to log into your shell and do things. Back then you may be able to trace the person who logged into your account but today this is getting difficult (even for NSA this can be difficult in some situations). Today hacking into anyone's /etc/passwd and decrypt all the password is a crime and your best friend will be more careful when handling secrets with you if you do that to him for "change your 123 to something more complicated".