But airliners have been lost due to a single engine failure, particularly on take off. You can't make a statement such as 'nothing will happen' as the poster did. The loss of an engine at a critical phase is commonly practiced yes, but you don't always know what is going to happen on the day, it is a risky situation to be in.
This is about a cost-benefit analysis, after all. No risk assessment is black and white.
This accident (assuming this is indeed a drone collision) show that there is at least a risk of property damage. I don't know about the cost of repairs, but it is probably 5, if not a 6 digit number.
Risk of life loss is pretty small, as far as I understand.
Probably it makes no sense to ground all drones at all. Probably it makes sense to implement some restrictions - or rather enforcement of existing restrictions via engineering measures as they tend to work better than administrative approaches.
People are talking about geofencing. Which should be a relatively simple one. SOme sort of "drop dead" signal emitted by the airliner? E.g. certain power of weather radar? What about GA?
There may be other ideas
It should not be about on-the-spot execution of drone operators, this is about safe coexisting after all.