It's nothing like Germany in the 1930s. Yes, it's pretty disturbing but facile and misleading comparisons just confuse the issue further.
In fact it's precisely the fear of seeing a rerun of Nazi Germany that has helped to bring about this situation in the first place, by leaving the Swedish authorities utterly unequipped to address any issues in the integration of the very large numbers of people from non-European cultures that they have invited to migrate to their nation.
Stockholm has a problem with North African street children around the central station. They gather in large groups, and target women for groping, assault and robbery. The Swedish police had more or less admitted they had lost control of the situation.
But Sweden's political elite is so in thrall to the fear of being seen as racist, inciting prejudice against migrants or in any other way violating the taboos of the New Left that they have been unable to do anything to address the problem.
As a result (and I am in no way excusing this) a growing proportion of Swedish society has been getting more and more frustrated. What you are seeing in this attack is ordinary people taking matters into their own hands, when they believe the authorities are unable or unwilling to help them. It is a profound breakdown in the social contract. But it has a background, and a context, and the Independent article is remarkably short on both, choosing instead of a clear-sighted analysis of what is happening to rehash exactly the same hand-wringing memes which have got Sweden into this mess in the first place.
What you are seeing here isn't a rerun of Nazi Germany. It's the first skirmishes in the oncoming civil war that I fear is now almost inevitable throughout Europe, thanks to the high-handed stupidity of European political elites and the incompetence of the EU.