Accidentally or on purpose, there is NO reason to do what that guy did. It’s wrong and people get cut off every day. A normal person, who has control over themselves, won’t go, ugh, Postal. If someone even thinks that the postal worker was right is in for a real surprise when they’re in cuffs, or worse, in a coffin.
That works both ways however, so next time you cut someone off, they could go off the deep end like this chode did.