I will if you keep bringing it up.
@Kempton Have a word boss.
As proven in court, a cycle helmet is of use for low speed, low impact, beyond that, it's more likely to cause an impact due to the momentum of the extra size and weight, false sense of security and perception of protection, as well as the risk from the straps. Americans found that parachutists with helmets suffered more injuries and fatalities than those without, largely due to snapped necks from the strap.
If you're so sure of, and understand the pros and cons of the helmet, presumably you wear one when walking, as that's when the arguments for its use are more valid. If you don't wear one when walking, then without realising, you recognise their limitations.
If real head protection is the goal, then the appropriate head wear would be a motorcycle helmet, as they are designed for the sort of impacts you mention.