I have zero pharmacology or psychology knowledge but based on my little bit of real life experience, I believe Ritalin inhibits a child’s ability to feel empathy.
We have two nervous systems, the Sympathetic Nervous System which governs Fear, Pain and Anger, and the Parasympathetic Nervous System which governs Love and Pleasure. If a drug is stimulating the Sympathetic NS, then it is hard for that person to experience empathy at the same time. This is an oversimplification, but try Googling those terms.
Who gives a rat's ass?
Your comment is absolutely spooky to me.
Today, when she came home from school, my seventh-grader named three of her friends, and said these three friends all seemed to "not have any understanding of other people's pain."
One of these three attacked my daughter at a post-Christmas party, kneeing her in the back so hard she had a visible bruise. This one is younger than my daughter by a few years.