Many (if not most) people have "picked a team" so to speak, and they want to be correct. If Sweden's way proves to be better in the long run, many of those people will have been wrong. Nobody wants to be proven wrong, hence the passion.
First there is definitely propaganda from Sweden or from its sympathizers who see the failure in this crisis as being an example of being wrong in other issues like immigration.
Secondly there are people who try to use Sweden as an example to advance their local economical or political goals.
Third there are people who see this nonsense though and do not want to be in the chain of stupidity.
