I think you are purposely being obtuse just to be stubborn because its the only explanation that basic facts and rules could escape anyone who watches football.
1) He didn't shove his hands in his face. That is a flat out lie and made up. Watch it again. As they pass in the normal line of scrimmage bump area Pettigrews hand goes right by his shoulder as Hitchens hand checks him and then they both hand check at waist level as he turns..all normal. He didn't touch or push his facemask once. Just hit pause quickly and its easy to see, In fact you can see Hitchens grab his outside arm too. All normal at that point. Swim type move where arm at shoulder pad goes to waist
2) Going through your points. Yes a majority of people who have discussed this agree. If Hitchens did hold its not "irrelevant" its a penalty so that is a throw away line by you that again makes no sense. He didn't use hands to the face at the start and if he did at all, it was after the hold. And it does matter what Pereira says because he knows the rules and explained it in detail...Hutchens doesn't have his head turned and runs into and grabs the receiver. Its basic interference. Whether they have the ball or not is the MAIN argument. They get 3rd down again and a chance to ice it and more time runs! It the crux of this whole things
3) Check the bolded. He did interfere with his ability to catch it. It didn't have to do with the facemask. It had to do with him grabbing his arm and then running into him before the ball got there. As for your last sentence...ITS THE FRIGGIN RULE!!!!!! If a defender has his back turned and doesn't play the ball and makes contact with a WR ability to catch it...its interference. Pic #1 isn't swiping a hand away from facemask. Pic #2 isn't touching a jersey. It's classic interference.
4) Add all that up and its simple. Missed calls. Listen there is no guarantee Detroit gets it the next play when they replay 3rd down but they run clock and still have 2 more plays to end the game. This board would not exist if the call went against Dez or something. It's hard to take anyone seriously who doesn't know the rules or can't admit we got away with one.