How in any shape or form does this film glorify suicide?
The review by cookie on fire mentions this, and it doesn't make sense. If anything the film wards off suicide as being the answer. If the family unit is under such extreme pressure and desperation, to the point of breaking point and as with many families today they don't comminicate / share their problems with each other out of some silly and misguided pride / mindset (something that has afflicted many a modern family especially in Japan), then sooner or later someone within that unit (or even all) will break.
It shows this perfectly with the fathers friend who is also unemployed. The desperation with the friends family was palpable. The husband and wife might as well have been total strangers, and this lack of relationship no doubt affected the daughter in all manners of ways. Yet all it would take despite the husband being unemployed, is communication. Or failing that, to disband the family unit to give the members of it another chance of life with others. Unfortunately, because of that damn pride of the fathers friend he didn't own up and communicate or let his wife / daughter out of the suffocating marriage. Their situation got to breaking point and beyond, and thus it was too late. I believe the director wanted to show this as a warning to the viewer as well as the father of the film that utter desperation if left unchecked can lead to such an outcome if you don't nip it in the bud and actually be a family instead of being people who just happen to live with one another with the acting of a family (those cursed automatic emotionless mannerisms shown throughout the film).
Unfortunately for the father of the film, he does not completely take heed of this warning. The warning does contribute to him getting another job (the cleaning one), but the problem is he thinks that was the only problem his family had. It was only when such an abrupt change happened for him (the found money, then the humilation of his wife seeing him as a cleaner, finished off with the hit and run) that he came to his senses and realises a misguided sense of pride isn't the answer (after which we then see him really getting into his job as a cleaner) nor is an outlook that revolves almost completely around money (to which the father then ditches the found envelope of money).
The other members of the family are also affected by desperation and go through similar situations as the father (especially the mother wanting to end it), before they realise what the actual problem was. All in all, this wasn't glorifying suicide but rather was a message to show that things need not go so far to discover the truth the members of this family discovered. If you simply communicate and don't allow certain factors (pride, money) stifle your life and the lives of those around you, such desperation can be managed and even defeated regardless of your financial situation.
But most of all, one should realise this film does not glorify suicide simply because of the director involved. It is well known that the director is adamant against suicide, which is why he made Kairo (Pulse). In that film he wanted to communicate the utter loneliness and despair that suicide actually is and brings, and that there is little dignified about it.
The same applies to this film, so cookie on fire don't say it glorifies suicide. It couldn't be further from that message.