Thanks, everyone. All the posts have helped me understand the situation may have been more complicated, at least in the coach's mind, than I thought it was. I'll be straight: I thought both calls were mistakes. Now, I'm not so sure.
Further details for scenario one (and there are more than a few, so please be patient.)
Home team. Down by two runs (2-0), bottom of 5th. No outs. First two hitters sharply single. Change of pitchers. new pitcher is his team's main reliever. Throws hard but not overwhelmingly so.
My thought: runs were hard to come by this game so get the runners to second and third any way possible. Therefore give the hitter every opportunity to get a good bunt down, which, to me, means letting him try to bunt the first good pitch he sees. Coach had him take, likely because the pitcher WAS new, and it's not uncommon to take a strike with a new pitcher in the game.
I understand that better now, but I still think I would have given the hitter the green light because I think it would have allowed for more chances at getting the bunt down.
(A complicating factor, which I think is worth mentioning because I've never seen it before: the batter (#9 hitter) eventually called on to bunt was a starter that game but had been told he was going to be pinch hit for at this at bat, so he was sitting on the bench, helmet off, watching the game.
The pinch hitter was more of a slugger type but not as good a bunter, so when the first two guys got on, the coach changed his mind (the pinch hitter was already walking to the plate) and put the original player back into the game for the bunting situation. The original batter had to scramble get ready to hit. Turned into a disaster because the bunter hit a little pop up that froze both runners. Ball hit the ground just out of reach of the pitcher, but the catcher was all over it and threw to third catching the lead runner, who had hesitated because of the little pop up. Meanwhile, the runner at first inexplicably froze, and was out at second on a force throw from the third baseman. Agonizingly, utterly, painfully, torturously destroying the rally. I have seen intended sac bunts result in players out at third, and even double plays from third to first with slow runners. But I've never seen BOTH lead runners get out on force plays after an intended sac bunt.
Second scenario: The boy who bunted was the #7 hitter. The other team's Ace was in in relief. One of the best pitchers in the league. #5 hitter got on with an error, and the #6 hitter walked. The bunter bunted with a 1 strike count. His previous at bats were well hit balls, one a single, and the other an error on SS, but the ABs were against a slightly weaker pitcher. I did not see where the infielders were, so I don't know if the third baseman was in or not. I also can't remember when he squared to bunt. He may have been bunting for a hit, after all. If that was the case, then my question is moot. I have to find out.
Thanks, again, everyone. Learning a lot here. Have three boys in the pipeline: 2017, 2019, and 2022, so imagine I'll be visiting often.