You are being far too generous to the drone pilot here, if he couldnt see the Kite in the vicinity (they aint small and they don't approach that fast that you wouldnt see it on a wide open beach between scans, if you are staring at your screen for long enough between scans to not see him approach when you have a half mile unobstructed view then you need to modify what you consider safe flying
The helicopter incident?, looks like very irresponsible flying from the helicopter pilot
sometimes flying within the law can be reckless, just as sometimes flying outside it can be safe as houses, we need to use judgement not be sheeple
Just my opinion of course, but you asked.