The explanation for that is in a way very simple, but logically the complete situation is extremely complex.
My simplest explanation for this is that in the past decades, especially here in The Netherlands, the more liberal political parties were running the business.
Liberal as in not conservative.
What you see here is that liberal parties (Dutch users; liberal means not 'liberaal' in this particular case, but is more loosely translated to "vrij") very often use the argument of morale in their debates.
This has became their way of politics in the past decades. It has been a very succesful way of argumentation since the people are very sensitive to it if a politician says "we should allow every alien/foreigner to enter our country and offer them a house/job/subsidy, because if you don't then that's morally not responsible".
This way in the past decades EVERYTHING was possible in The Netherlands. It gave us a lot of good things, but in the past decade with the HUGE influx of immigrants and even stronger growth of moral discussion/arguments by these politicians a lot of tension has grown.
Shortly summarized: everything should be accepted with arms wide open, no limits, no difference in people (which generally is good).
What happens now: conservative parties grow in popularity as it turns out the liberal parties made a mess of it since their morally responsible problems also cost a damn lot of money. There's not much argument there, since it's fact-based, world-wide. There's a sinusoidal trend in politics where the conservative policians cleans up the mess of the liberals, often by making very impopular decisions which are morally questioned by the liberals
Once the mess is cleaned up the liberals regain power and the process starts over again.
Currently we're in a transitional phase where conservative and liberal parties struggle to control the situations, which lead to expanded attention to futile incidents like with this kid.
What this kid did, as understandable as it is since the kid just can't know/understand (yet), is now used as a vehicle for liberal parties to show they're morally superior.
