lilla, I have been pondering your post for a day. Your conclusion was that your two students had tears in their eyes because these days children are not "held accountable". I didn't see the connection. Then finally realized that the clue may be in "held accountable".
My philosophy centers around "taking responsibility", and "experiencing consequences". Yours is in "being held accountable" and again, "consequences". I have a feeling that there is a difference between the two ideas. First I thought they were different words for the same thing. If a child takes responsibility, then he is involved in his own learning, and does what he needs to do. Your students didn't practice. The consequences of not taking responsibility (not practicing) is that you end up playing poorly, and messing up in front of the teacher. If I point out to my student that his playing is horrid because he has not practised, and if he practises his playing will not be horrid, this will not lead to tears. But you said that your scenario ended up in tears. That's where we must be thinking of different things. So I thought about "being held accountable".
When I read these words, I see something being done to the student, rather than the student doing something (taking responsibility). My mind jumped immediately to crimes: you have stolen, and you get punished, or are forced to give restitution. You were reckless and hurt someone in an accident, and get punished, pay a fine. You were rude and hurt someone's feelings, and you are forced to apologize. You are being held accountable - nobody is bailing you out - and somebody is doing something to you. The "consequences" in these scenarios are unpleasant things, punishment, judgment. Yes, that would make somebody cry, especially if they've been bailed out all the time. So is that it? That the children were not used to somebody being displeased with them?
Or is it that both children have been told that everything they do is wonderful, so that this bursts their bubble? One would think, though, that being told they're wonderful ultimately is boring, because it does not lead to practising. Humans - any intelligent living creature - is designed for challenges and achievement. That's why kids play video games, where they can continue upping their skills. How do we channel that back into learning, and how did it disappear from learning in the first place? What's happening in the schools?