When somebody is upset about something, (or anything) they
will sue another person.
85% of the time people
will sue others for the stupidest reasons on the face of the
Earth.
When someone "sues" another, it is usually done by somebody with a huge ego and greedy intentions.
Although it can help our society and solve problems amongst ourselves, too many people abuse this power. In the end, it becomes more childish then a kid throwing a temper tantrum in a toy store.