And what about you?...

Have you ever been in one of those arguments where you were upset with someone about something they did, or didn't do, as the case may be? "You left the mayonnaise out", or "You didn't put  the car in the garage last night." Or something like "you really piss me off when you say that."
"Oh yeah, well what about you, you never put the butter back in the frig when you're through with it, you always leave it out like someone is going to come behind you and put it away for you." or "I ALWAYS have to remind you to do things or you'd never do anything."
If you point out someone else's fault that is bothering you or something they did is causing a problem you're immediately met with a rebuttal that points out yet but one (or more) of your own shortcomings. It immediately becomes a circular argument. You, or whoever started it, want  to make a  point that the other person has a fault that is a problem. But instead of "Oh, OK, you know you're right, I shouldn't  do that. I can see how that would be an annoyance to others." Instead you open the tap for a flow of admonishments for your own faults. And back and forth you go. Or round and round you go, whichever you like.
What if your boss called you in and told you, "You know Bob, you're not finishing those TPS reports on time." And you let loose with "Well you know Herb, you never finish shit. Ever. All you do is start something then send it to me or someone else to finish. So, if you don't finish shit, why should I?" Just another circular argument. It's the same as if your wife says "You never put shit up,
you leave everything out." "Oh yeah, what about you? You leave makeup all over the bathroom counter. You never put it up."
Does anyone leave a circular argument feeling like "Well, we certainly took care of that." No. Except your boss, when he fires your ass.
I know, you're wondering, where is this going? Think about the presidential debates. Each time Hillary or Donald criticized the other they were immediately hit with a return cheap shot. You  never pay taxes. You deleted 33,000 emails. You are a racist. You're incompetent. Shit, why don't y'all just get married. You'd make a hell of a couple...
I hate circular arguments. "I don't like what you did."
"What about you? I hate when you..."
"Hold on, first let's talk about when you..."
"Bullshit. You think you have a right to complain about me when you..."
Everybody gets pissed off and keeps on doing whatever they were doing to piss the other off. Nothing gets better, in fact the  circular argument makes things worse if anything. It's pointless and futile. which  is probably why politicians do it. Hell  they were probably the ones that started the circular argument.