A bit off topic but still related. Is this a competitive Boys U10 or U12 team, or a fall recreational league? I'm guessing by your description that it's a rec league we're talking about.
I always had one basic philosophy as a coach. Did the player improve their individual skills from when they started the season to when they ended. Quite frankly, I was awful at game strategy. And I coached teams that ended up on the wrong end of the scoreboard in the end, at times with totally classless opposing coaches running up 12-1 scores by leaving strong players in for full time and not leveraging other techniques to kepe the results in check.
Yet those players I coached were better by the end of the season. They saw the game better. They handled the ball better. They defended more aggressively and better. And in the end, that was how I saw the role of the league. This wasn't a college or pro team, where the results of the team mattered at times more than player development.
You can recenter your focus to stop going nuts. After a game, talk about DS10's individual play. Was he in the right position? Help teach him where he should be based on his role. They still may score because the other players are out of position. But if DS10 was where he needed to be, praise that. If his play was aggressive but within the bounds of fair play, praise that. And if DS10 is better at thte end of the season than when he started, praise that.
Remember we won't always be there to give our kids direct support. I've got two in college now, and they have to fend for themselves when they need to question a greade from a professor or be their own advocate when the class they need is showing as full. All we can do as parents is mentor from the sidelines, praise them for hard work, and send them back to the field (or the classroom) with a sense of empowerment. Look at this as practice for DS10's later years when he'll have to speak up for himself.
If we look at how our A's have changed us from our past, we stay stuck in a miserable place. IF we look at the opportunity to change who we are and how we can make the world around us a better place by being better people, we focus on the hope of tomorrow rather than the dismay of our past.
BW(her)- 57, FWH (me) 59. 4 month Online EA, M 32 years, together for 36. 3 Daughters and 1 Son - 32, 29, 25 and 24. D-day 6/2/07, in R. FORGIVENESS 1/1/2008!!!". Action expresses priorities." - Mohandas Gandhi