this is simply not true, and there's tons of scientific evidence of the contrary. ADHD makes you vulnerable to abuse because generally speaking people have a hard time dealing with the foibles of ADHD people. That makes you a target. We know that from science, there's no point in theorizing. ADHD is mostly genetic, highly hereditary and both under diagnosed and under treated. That's all there is to it.
You are arguing that childhood trauma doesn't have a causal relationship to ADHD?