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This is a question of morality and quality! This is also a national issue. Two days ago, a little boy was just killed by throwing glass at high altitude. Another lady just got out of the subway, and a cleaner dropped an angle iron from the sky and smashed her head, which almost killed her ... In recent years, there has never been a case of death and serious injury caused by throwing objects from high altitude. The culprits have been found in the above two categories, and many can't find the perpetrators. If there are victims, they will take the property owners to court and let them collectively compensate. What the property company can do is to publicize, pull banners and put up notices everywhere, and there is no fundamental way. To put an end to this kind of thing, in the final analysis, it is still a question of moral education and personal quality education, that is, family education. You can't grow up in a day or two. Now we should protect ourselves and travel as carefully as possible (this is really a kind of sadness). You can also use some extreme measures to do this upstairs, such as pulling the net, such as installing a camera, which is facing the parabolic direction. Once you have the evidence, go to court. Hope to adopt.