Marie Kondo has become famous by tidying up（收纳）things.Ever since she was a child，Kondo has found joy in organizing objets.Now,34,she has written a bestselling book and presented a TV show about it.
Kondo's way of tidying up things is known as the KonMari method.It sets out how to organize things.Its followers must first sort out（分类处理）clothes，then books，papers，and at lat objects that are cnnected to a special memory.Anything that doesn＇t spark（激发）joy should be thanked and then thrown out.
Kondo has gathered many fans.She says,"If you want to lead a life that sparks joy,there's only one thing you must do. And that is to tidy your home."
However,some people said that the KonMari method is too harsh,especially when it comes to books.When Kondo said she only kept about 30 books in her home and had thrown away all the rest, many people were against her.They said that having books makes them happy. When they think of someone throwing away books or having only a few books,they become angry.But Kondo replied becoming angry shows how much they love books.That in itself is a very important advantage of tidying up.
What does harsh in the fourth paragraph mean?