Quoted from Rat_Tomago:
I have been online in some form or fashion since 1985 and my first Compuserve account. When people get online they have a sense of invulnerability and they suddenly become a 6'5" linebacker for an NFL team. I can't wrap my head around it sometimes when I meet these same people in person. Nice in person and a asshole on the computer.
Agreed, it has been happening on the roads for decades, nice people become assholes behind the wheel, keyboards and steering wheels gives some a sense of invulnerability sort of like a third person perspective, they are not like it in the first person perspective. Er, that's my perspective anyway.