At what size/mass limit do you suggest that "drones"become subject to regulation?
Answered your own question...
A cigarette packet sized $25 device, could destroy a turbine engine if it was ingested.
Are you suggesting that the government should now regulate all model aircraft?
They ARE regulated: "keep away from airports". And they do. And of course the pilot of a model aeroplane is probably far more alert to the threat (and the rules for operation) to real aircraft than 90% of the riff-raff steering their drones through the sky.
In any case, my gripe wasn't so much with the regulation but the preposterous suggestions that aeroplanes should keep out of the way of drones that the (aeroplane) pilots see.
Another example of a disruptive technology where the rule-makers are too weak to come down hard immediately and nip the threats in the bud.