All due respect, Kimmi, but you and moonslav are making mountains out of molehills. Neither mental mistake penalized the Sox or affected the outcome of either game. The rule book is endlessly complex about all kinds of situations, but we expect managers to think of that first and not what he wants to do in the pressure of the moment?
As for the players mental mistakes, they are result of the intensity of baserunning vs. the unending and dreary reality of staying alert during 3 1/2 hours of pitchers and hitters and coaches and managers doing their little dances. In JBJ's case, it was egregious, no denying that, but we have seen other teams do similar things.
My one serious complaint on this score is the way some of our pitchers are slow to cover 1b on grounders to the right. Sale never does that, but several of our guys have. ERod is one of the worst offenders. So, yeah, that's on the coaches and Farrell, but let's not forget ERod himself. He is the guy who needs to maintain his focus and game awareness, and that is a huge difference between the way he conducts himself on the mound and the way Sale does.
Similarly HanRam, a veteran of over ten years in MLB, is definitely flaky running the bases, which is exacerbated by Farrell's willingness to allow his players be aggressive. Betts, with far less MLB experience, is the opposite of flaky--almost certainly the result of his make-up and of course speed. Betts has a real gift for quickly sensing what he can do vs. the risks. Benintendi has the speed, but not yet the the intuition Betts has. He might never have it.
About the aggressive baserunning. When you are near the bottom of MLB in dingers, aggressive baserunning makes sense. Even Sandy Leon, who is incredibly slow, has been aggressive to very good effect. It was risky, but his amazing slide made it work.