According to the latest survey of the Japan PTA Council, TV Asahi's "London Hearts" is the worst TV program for kids.
That program has been ranked the worst for eight years.
The second worst program is TV Asahi's long-run animation "Crayon Shin-chan", and the third one is Fuji TV's "Mecha Mecha Iketeru".
The main reasons why the parents don't want kinds to see them are like this:
・They are too ridiculous.
・They use vulgar language.
・They include a gross deviation from the moral.
・They may be a hotbed of bullying and prejudice.
I think the recent children are less kinder to others than they were in the past.
Probably they are strongly influenced by some TV shows and can't separate fact from fiction.
That survey includes many other items.
If you're interested in that, have a look at this→22年度-子どもとメディアに関する意識調査（pdf）