Because it's the internet.
If you post something about solution X, you will probably not get a reaction from someone that likes X, but thinks Y or Z is a better idea.
No, instead the first reaction will probably be by someone that absolutely hates X.
Opposites attract, you are more likely to 'encounter' someone that thinks the complete opposite.
Another issue with Nostalrius and
US politics is that you basically have two camps, two opinions that rise above the other ones.
We really don't have that on r/thenetherlands. When there's a thread there you have people that support ten different political parties, all of them giving a small little twist to their ideas on the topic.
Again: The internet.
First of all you don't have to change one person's mind in 10 minutes.
You have a million people that all need 10 minutes each.
And the second part is that people often lack the will to be educated.
So often have I seen a user put in quality time to debunk and explain a topic to user A.
And the next day user A just continues to be ignorant and acts as if someone hasn't spend half an hour typing out a post to explain certain things.