It is not suicide as they claim to be dying in the cause of Allah and if this means killing oneself in that cause then so bit it; Paradise!
If you kill yourself alone then this leads to paradise being denied, but not so if you kill others as well.
This is a sickness that has totally destroyed striving, struggling and yes, dying, in or for the Way of Allah which can ONLY be trying to help oneself to better oneself AND of others. The persecuted are to be freed from their oppressors, the hungry fed, the homeless housed etc and if by helping others you die then paradise becomes your abode.
The sickness turns the "killing of one innocent is like killing the whole of humanity", into everyone is your enemy and hence guilty of waging war on "Allah and His Rasool", so there are no 'innocents'!