Because #1 literally isn't a big deal. It's what every acting AG does for the President. You just see it as a big deal because you are operating under the notion that anyone who is on the Presidents side must be inherently evil. When articles like this are posted in only furthers your confirmation bias as an article like that is intended to do.

This AG didn't investigate the President, a special counsel did. A special counsel that was not under the supervision of Barr, but rather a former AG and deputy AG. Oh and that deputy AG suggested illegaly recording the President, how is that for ethics?

The Mueller report is out in the open. You can disagree with Barr's analysis, but nothing he has done has been outside the law or the function of his cabinet position.