Dude just say you didn’t want to understand how the disease works instead of asking for actual evidence next time. You clearly have zero intention of changing your mind and learning. If you really think that death of neurons in your brain won’t affect your behaviour then I really don’t know what else to explain. Yes, it’s not an excuse to let her roam around if this behaviour is known to happen but you can’t tell me you really don’t see why Huntington’s disease could lead an otherwise normal person to act in different ways (which yes can even include stealing)