Let's face it, parents are not perfect, they are people. There are lots of people now who like to look for the quick-fix and who don't get involved with what their kids are acctually doing. These are the parents who put parental controls on everything, the people who don't like violence or the real world in anything their kids are watching, and who, when they are annoyed will take their inadequacies as parents out on your tamagotchi. It's easy to blame inability to parent on an object, video game, genre of music because it is easier to fix than the real problem.
If parents want their kids to play with the Tamagotchi less, there are ways to do it. They could find out how and why one would have fun with it, they could spend more time having fun with their kids (getting to know their child's favorite activities), they could set up a log so the child would have to log in the time that they spent playing with the thing and not go over a cirtain amount....
Blame for misuse usually falls upon the parent's shoulders THEY ARE THE PARENT. Instead of letting the little guy be a problem, they could make it work to make the child more responsible.... I'm sure that the kids whose parents play with tamagotchi too are least likely to just randomly take the toy away.
What I'm saying though is not that we should all start a finger pointing group but that, if you notice your parents getting angry talk to them about the problem. Try to make a solution. Come to some agreement. Don't let your little Tamaくん get you in trouble! There is always a solution!!