why do we blunder in chess?

Do you mean the rating that gamereview gives you? This rating doesn’t reflect your strength and shouldn’t get much attention.

YouTube content is optimized for engagement, not for helpfulness. Don’t waste your time on it.

There are some very good channels, however overall I agree.

cheating comments removed 

Mod Andrew smith 

Because we are humans?

You have to put in more effort than what you're doing. 500 games in 2 years isn't enough

He's not a cheater, he's just a racist

then please report him for racism

If you’re the one who witnessed it, why do you want others to report if for you?

So we can learn, and blunder again.

OMG the more report him the more likely he gets banned

Back when I was playing passable chess, most of my blunders came from thinking deeply and then forgetting that couldn't play a certain move because of an immediate threat. Now days, I blunder because I'm just not looking at the position. Perhaps laziness. Perhaps too many dead brain cells.

Blunders happen because we, as humans, don't know what the person on the other side will do. Take this example:

You try to perform the fried Liver but you blundered. The queen will take. Surely after taking, black is winning, right? Well, not exactly. Look at this diagram:

The pawn is pushed, doing a revealed attack on the queen with the bishop while the pawn is attacking their bishop. For them, it just looks like your attacking the bishop so they'll take it with their pawn. That's a blunder because you can now take their queen. I hope this answer was relivant. Bye!

b/c we're stupid

Chess is hard & humans just can't be correct all the time.

because we think the opponent is wrong

who is we

We three kings, we come from so far, one in a taxi, one in a car.