notability: This is not intended to be another "why is there racism" question. The Koran-burning and related activities have had direct impact on NATO membership discussions and delays. Based on that, I think this particular situation has a potential international relations aspect that could benefit from some further exploration and fact-based answers.
Al Jazeera's July 25, 2023 Qurans burned outside Egyptian, Turkish embassies in Denmark begins:
A small group of far-right protesters set fire to copies of Islam’s holy book, the Quran, in front of the Egyptian and Turkish embassies in Denmark’s capital Copenhagen.
Tuesday’s anti-Islam demonstration in Copenhagen by a far-right, ultra-nationalist group called Danish Patriots followed Quran burnings the group staged on Monday and last week in front of the Iraqi embassy.
Two such incidents have also taken place in neighbouring Sweden over the past month1.
Racism and xenophobia can be found in any country if you look hard enough, but when it rises to specific anti-group demonstrations including burning things (e.g. How does one buy a burnable American flag in Tehran?) there's likely an articulable history or cause. For example, rise of anti-Muslim public sentiment and actions (some may argue even in law enforcement and government in some cases) in the US has may have its proximal cause in the September 11, 2001 attacks resulting in the destruction of the World Trade Center in New York City and its associated trauma on the city and country and loss of 3,000 lives that day (and likely many in the following years due to hazardous substances released by the collapse and inferno).
The anti-Muslim racism and xenophobia was subsequently amplified by various groups in the US as well as some prominent politicians.
Question: What history or events are likely to have triggered, or are being used by Koran-burning anti-Muslim groups in Denmark and Sweden to justify their deliberately inflammatory actions2?
1"Past months" actually links to an article from April 19, 2022, or about 15 months previous to this article. Hat tip to @ccprog for pointing that out, who also goes on to say:
...the Quran burnings in Sweden in June 2023 I know about were not staged by Swedish nationalists, but by an Iraqi refugee.
2One might argue otherwise, but to me burning Korans in public in media-covered events feels more like it's intended to inflict pain and outrage on Muslims rather than to inspire fellow citizens, but that's just my current impression.