Gunz, there is a difference in a coach intentionally running up the score, and a coach saying, "to hell with what people think, my starters are playing one half for 60 minutes." Going by what you said about a passing team being up 60-0, and then needing to work on their run game in the second half. Again, we disagree. What about Giles if they are up 60-0 at the half, then going by your statement, it should certainly be ok for Giles to pass every other down in the second half. Obviously, you and I know that with the very first pass that were to go for a score in the second half, before the guy even runs into the endzone, people are complaing, "they are running up the score."
I again agree with your premise that intentionally running up the score is wrong, but where I disagree is.......a coach should not go out of his way in the second half with second string players to try to keep the score down.
I coached years ago and we had a unwritten rule for our district among coaches that starters play regardless of score for the first half and they do what they do offensively for 60 minutes. Additionally, second stringers and backups would play the second half, but.....an offense would still run its offense. It's not about being a passing team and working on running in the second half or a running team working on a passing game in the second half. It's about doing what you do offensively with your backups. If you run spread and pass 70% of the time and run 30% of the time, then do the same with your second stringers and let them run your offense and not alter what you do in order to keep the score down. With that written, its 60-9 with 1 minute left in the 3rd and you have the ball 4th and 1 at the opponents 33. OK, yes, common sense says punt. Common sense rules still apply.
If a team has a huge lead and wishes to start subbing early in the second quarter, that is fine. Most important, no starters play in the second half. If a team chooses to play all starters for one half regardless of score, that is fine with me as well. I have been the recipient on both ends of blowouts given or received. Only one time did I actually feel a coach attempted to literally cause harm, with intent to run the score up. Far, far, far more times than not, coaches don't attempt to run the score up. But...there are coaches who insist on starters playing one full half. I was one of those and still believed it should be that way.