A disturbing fact about the Flying Wallendas

The seven-person chair pyramid that killed two of them.

The Flying Wallendas are circus performers best known for doing high wire acts without a net. As you might imagine, a number of them have been killed and horribly injured over the years.

According to Wikipedia:

In the following years, Karl developed some of their most impressive acts, such as the seven-person chair pyramid. They continued performing those acts until January 30, 1962 when, while performing at the Shrine Circus at Detroit's State Fair Coliseum, the front man on the wire (Dieter Schepp) faltered and the pyramid collapsed. Three men fell to the ground, killing Richard Faughnan, Wallenda's son-in-law; and nephew Dieter Schepp. Karl injured his pelvis, and his adopted son, Mario, was paralyzed from the waist down. Dieter's sister Jana Schepp let go of the wire to fall into the quickly-raised safety net, but bounced off and suffered a head injury. [emphasis added]

Mario was 21 when this happened.

Why on earth were these people allowed to adopt children?

Mario at age four already forced to perform dangerous stunts.