What are the cops going to do? Round here at least, thought crime isn't yet a thing. It'd essentially be the same as if you said "Sometimes, I want to hurt people". If you're actually speaking with a medical professional, what you say is legally privileged information, and AFAIK for the US at least, that continues until there is reasonable belief that you will harm someone or commit a crime.
This totally glosses over the social aspect, but for any legitimate medical provider that shouldn't be a problem. I don't want anyone who needs help to be afraid of seeking it.
Are you perhaps saying that trying to teach an understanding of a concept like place value or carrying is more complicated than just getting the answer to an arithmetic problem? I have no idea why that should be the case, where would you get such an idea anyway?