Have you ever thought about that with respect to individuals with ASD? We are quick to view their comments, silences, meltdowns, and actions as meaningless, unanticipated, inappropriate, or even defiant. Yet I believe that if or when they are able to process and to voice explanations for their actions, they usually have very valid reasons for them!
What then causes them to do what they do? Here are some possible explanations:
Each of us is constantly bombarded by sensory information. What our brains do with that information can vary widely, and can produce just as wide a variety of responses! But frequently those responses are perfectly valid given the way that our brains processed the input.
Do you perceive a noise as painful? It makes sense that you would cover your ears, run from the noise, or try to drown it out in another manner. Are you adverse to certain sensations? Then it seems appropriate that you would avoid getting your hands dirty (and any tasks that would lead in that direction), or refuse to wear particular clothing, or react abruptly (or even forcefully) to distasteful touch. These responses make even more sense when paired with some of the following explanations.