> Parenting choices can be a way of harming people.

Sure, but the clarity of the information on which choices are likely harmful outside of fairly direct, physical harm is often far less than the shakers would like to pretend; it wasn't long ago (in fact it still happens even though the recommendation of the AAP has since caught up with the science) people were being shamed for providing early exposure to various nuts (the evidence note suggests the old advice that shaving was based on produced a huge surge in nut allergy prevalence, rather than mitigating risk.)

> People who harm people should be shamed.

And shaming, anyway, isn't all that effective (and certainly not a harm free) method of correction even when based on correct premises; when based on faulty premises it's an unmitigated harm.

So shamers generally deserve, by that standard, to be shamed; by a reasonable harm minimization standard they need to be corrected.