The 10-year-old son of someone we know has to stay alone for 17 hours at home from 1:00 p.m. to 6:00 a.m. while his parents having fun partner swapping at the swinger club. If the boy needs his parents (if their mobile phone works!), they need nearly 1 hour to get home. The boy has dinner alone, watches TV the whole time and has to go to bed alone. They are living at a detached house since 10 months, where no one around knows about his situation. Who could help the boy immediately if something happens? The parents said, that their son is "not a baby anymore and would not burn the house down" when they are not at home. I think this is absolutely irresponsible! Is the parents behaviour normal? What do you think?

Child=Responsibility.
But I think you SHOULD report this. It's not fair to the kid.
N. x
I don't see much of a problem. It teaches independence. I wish my family would've left me alone at a younger age instead of waiting till I was about 15. If they did it sooner, I probably wouldn't have been so dependent on them. How does he feel about this?
I think, you are partially right: it teaches independence - but I think, 17 hours, over night till daybreak is too long. We are not talking about 2 or 3 hours...
Are there no aunts/uncles/grandparents around? Why have they not hired a babysitter?
Maybe report it to whoever it is that deals with child cruelty in your area too.
That is not right or fair, I don't think
I think I talk to the parents before I report it to a youth welfare office... keeping silence is the wrongest way to go!