Linux communities (and NixOS the most) are people who are overwhelmingly anti-arms companies.
I have no data on whether that is true or not, but it is certainly a bold claim. There are at the very least plenty of very loud people in the broader Linux community who are explicitly not anti-arms-dealers.
For the particular discussion you’re referencing, the broadest consensus against the sponsorship I could gather was “let’s not get involved in this and the obvious political message it would send”. Did the discussion draw out far more strict stands for & against? Oh you betcha. But drawing either of the extremes as the broad consensus is a disservice to everyone - and in particular to the project.
To put it in slightly less aggressive terms an equivalent would be “the sponsorship agreement with Manchester United is divisive - let’s not get involved in football”.
I suppose the extremes would then land somewhere along the lines of “football is a crime against humanity” and “the anti-sport faction wants everyone to be unhealthy - they obviously hate our children”. Again, drawing either of those as the broader consensus would only be a destructive stance. It is either unhelpful or serving a very specific purpose.