I like PA announcers that are homers and interested first and foremost in their team, their fans. I love home field PA announcer bias. It adds to the experience of an away game. An away game experience should not be miserable for visiting fans or players, but it shouldn't be comfortable either.
Miserable/Unethical is..
1. Horn or train whistle or PA guy talking while visiting team is at line of scrimmage. After the huddle is broken, it should be quite with exception of fan noise.
2. PA guy overtly questioning/challenging the officiating.
Uncomfortable for visiting fans that is awesome and ethical in my opinion is...
1. PA guy encouraging his team, yep....even with a statement like, "come on defense, we need a stop here!" Or..."come on fans, let's make some noise and get on your feet!"
2. PA guy purposely loud when his teams makes a play and is quick to call out the name and number, and......a PA announcer that is pretty quiet and maybe even absolutely silent when the visiting teams makes a play or scores, and he doesn't even acknowledge the other teams players/numbers/names when they make a play.
The above is my take on it. I think it should be uncomfortable for visiting fans with the PA guy, but not miserable or unethical. Why do I feel that way? As Americans, we have come to the point where we ALWAYS have to be comfortable and our KIDS must always be comfortable as a whole. Clearly, exceptions to the above exist, but when kids become adults, they realize life isn't always comfortable and presents incredible challenges. A little adversity or discomfort early on helps them steamroll through adversity when they become adults compared to those who have fa Ed little to any adversity in their youth. When the visiting team is in the huddle, I would fire up the train horn every single play, but....when they break it, time to turn it off.