I definitely think you need to pick your battles with the whole incident report issue. I come across things almost every day I could 'write up' if I wanted to. . . missed/forgotten medications, unbathed patients, writing the blood glucose from 2am as the 6am fingerstick....
But I pick my battles, I save writeups for errors that truly harm/could have harmed the patient. Example: the DKA 20-year old in a coma who came up from the ER on an incorrectly programmed insulin gtt. It said 12 units an hour, she was actually getting less than one. That, I wrote up.
I would never have written up something as minimal as piggybacking D5 at KVO into blood tubing. Against policy? Sure. Could it have harmed the patient? No. That's where you go to the nurse and say, "Hey, you probably didn't realize, but...."
Call me ballsy but after a few years you learn when to use professional judgement with your coworkers.