" Atrocities committed under the auspices of Islamic jihad are attributed to small and, allegedly, insignificant groups, to ‘Lone Wolf’ attacks and to mental illness."
There is not necessarily any contradiction between any of these three things. A huge proportion of the attacks (albeit not the most deadly) have, to the best of our knowledge, been lone wolf attacks. This is a list of all the terror attacks that have happened in Europe between 2012 and 2016. Notice how many of them are lone wolves:
https://en.wikipedia.org/wiki/Wave_of_Terror_in_Europe
That is one of the most dangerous aspects of the terrorism we're facing today - in a lot of cases, groups like IS actually don't need to co-ordinate a lot of it. They just put out the call and local radicals do the rest. In the cases where IS or equivalent clearly have co-ordinated it (like Paris), you won't see anyone referring to it as a lone wolf attack.
I understand it's frustrating, but all you are describing here is a desire for accuracy and understanding the problem in a comprehensive way. We can't do anything about these attacks if we are not realistic about what they are.