Again, just to get back to the statement which launched this thread:

   Studies like this are hard, because they're usually labeled 'racist',
   or it turns into an ad hominem attack on the authors, or struck down
   in the media for singling out some minority group.

You stated this was not true, upon which many reactions - mine amongst them - came with citations to prove that the original claim was, indeed, true. I presented a few examples to prove this point but you keep on talking around the issue - "studies are labelled racist, authors are attacked verbally" (and sometimes physically, see the actions of Antifa/AFA and several islamist groups). The result of this is yet again shown by a study published by the Swedish defence academy ("Försvarshögskolan") which was recently published. To quote from an article published today on SVT (Sweden's national broadcaster) about the fact that Sweden has become a recruiting ground for islamic terrorism due to the fact that this activity was close to risk-free in this country [1]:

   Vilken roll kan det ha spelat?

   – Jag tror att den aktivism som fanns mot både Säkerhetspolisen
   och de som försökte lyfta allvaret i de här frågorna. Det gjorde
   att tröskeln blev högre för både politiker och andra att ge sig
   in i det här området, säger han.

   – Man riskerade att bli utpekad som rasist på ett sätt som man
   inte såg i andra europeiska länder. Där var den här frågan lika
   okontroversiell som vikten av att bekämpa nazism och högerextremism.
   Men i Sverige tog det lång tid innan det gick att diskutera jihadismen
   på samma sätt som vi under lång tid diskuterat nazism, säger Hyllengren.

Translated:

   What role can this have played?

   – I think that the activism against both the security services and those
   who tried to point out the seriousness of the situation [played a role].
   This made that the bar was raised both for politicians and other who
   would dare to speak out on these subjects, he said.

   – You ran the risk of being pointed out as racist in a way which was not
   seen in other European countries. There this question was as uncontroversial
   as the importance of fighting nazism and right-wing extremism. In Sweden on
   the other hand it took a long time before it was possible to discuss jihadism
   in the same way we've been discussing nazism for a long time, says Hyllengren.

This is, yet again, a literal quote proving the point of the original statement which launched this thread. While it is possible to discuss the finer details of what and why and how the extreme-left wants to put a racist label on this but no that, the fact stands and the effects it has on society are chilling. Where freedom of expression was once a stalwart talking point for the traditional 'left' the current stance taken by many of those identifying themselves as 'left-wing' is an anathema to this foundation of the enlightened society.

[1] https://www.svt.se/nyheter/inrikes/sverige-16