[tel]

Well, should you take a cultural relativist POV then there's nothing "true" about Kantian ethics—it's a choice of values. It's interesting to see 21mo behavior selecting for those values.

If you take the deontological view then this is still a fairly complex behavior to execute. To consider whether this sort of judgement is one that should be fairly placed on the 21mo if it did the same is a challenging mental task.

So, perhaps babies are predisposed to heuristics which favor the categorical imperative. That'd be interesting and certainly worth surprise.