Why is it impossible to destroy poisonous and inedible mushrooms?

It is impossible, in principle, to destroy everything that is dangerous or simply dislikes a person. Poisonous and inedible mushrooms are very important in nature. Even if they are parasites and destroy t plants, they are important for the biosphere. Such negative factors contribute to natural selection. Poisonous mushrooms help some animals. They are also involved in the destruction of old wood and organic matter. This makes room for new plants. But in parks, it is advisable to destroy such mushrooms, as small children or pets can be poisoned by them.