Re: What's the problem? skilled hobbyist can build similar quadrocopter from the ground in few days
I think you're missing the point.
The question isn't "Should people fly drones in to restricted airspace?" They obviously shouldn't just like people shouldn't drive on the wrong side of the road.
The question is "Should DJI warn people who are about to fly in to restricted airspace and require them to explicitly override the protection (eg if the airspace maps are wrong or out of date) or should they prevent it completely." The car equivalent of that sort of "protection" would be stranded if it ever hit a contraflow at roadworks.