I don't have kids, but I think my opinion still counts. Sorry if I get longwinded here, but here it goes
The reason I am against earrings in any men period, is the public perception of it. Here's a little story for ya. I have a 4 year old nephew, he is a diagnosed genius in a special school, and is as handsom as he can be. Clean cut, nice clothing, well mannered. He is absolutely brilliant and I see him as being a leader in the future. Now, if I ever saw him with an earring, my perception would totally change. How many world leaders have you seen with earrings??? The earring may not be wrong, but it just doesn't fit with those who have a major positive impact on society. Maybe if the earrings were taken out now the holes would grow back, but again they may not. Just seeing the holes would remind me that they had been pierced. I'm not saying you want your son to be the next president or even company CEO in the future. These are just my feelings. However, I know for a fact that the majority must be with me on this one, because we haven't elected any pierced presidents, senators, or state representatives yet.
May be a weird explanation to you, but makes plenty of sense to me.