Originally Posted by Xurtio

Standing in the corner is not comparable to causing physical pain, particularly by a primary caretaker. Siblings are already competitive, by nature, especially the closer in age they get, but primary caretakers reserve a special place in a child's life and their interactions will form the basis of their attachment methods with other people as adults.

There's a clear mechanism for causation from physical pain to anxiety disorders and statistical correlation in the population. What more do you need? Some abused kids don't stop misbehaving, they just stop misbehaving in front of their abusers, others stop misbehaving, but also stop thinking for themselves or feeling safe to explore and be curious about their environment (which stunts emotional and cognitive development).