Security drawbacks of disabling tty password check

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http://unix.stackexchange.com – I found that, in /etc/inittab, this modification (-a username) for the user u disables the login/password check for all tty:s: 1:2345:respawn:/sbin/getty -a u 38400 tty1 2:23:respawn:/sbin/getty -a u 38400 tty2 3:23:respawn:/sbin/getty -a u 38400 tty3 4:23:respawn:/sbin/getty -a u 38400 tty4 5:23:respawn:/sbin/getty -a u 38400 tty5 6:23:respawn:/sbin/getty -a u 38400 tty6 That would be great for me, not having to type the password all the time! Question is, apart from the case when the computer gets stolen, the thief could use the system (which I would prefer, come to think of it), what se (HowTos)