Why do people answer questions with the following:?

Probably to get the points just for answering.Or they can't hold an intelligent conversation.

Some people don't think or realize that Y/A is for genuine answers. But then stupid questions are given too. So in that case ask a stupid question, get a stupid answer. Others are just giving any dumb answer for points. Does that make any sense!! But for serious participants they think out the question and give an honest answer. To me that's the joy of Y/A.

They feel that if they've taken the time to read the question, they should at least take the time to answer the question - to show that they read it, even if it does mean that they leave a totally unrelevant answer.

I agree with you, people just answer with one or two words just to get as many points as they can. I myself answer with intelliegence and actually give an answer. My goal is to be in the top 5 global leaderboard.

Because they feel they will not get cuffed with a violation notice.

Don't forget "IDK" and "Tnx 4 da 2"