The NK create sakonos nefoshos by being mechazek enemies of Jews that want to kill us. If someone entices a vicious dog to attack a person – the enticer is chayov. In legal terms, they are aiding and abetting murderers of Jews. This puts them in the same category as the murder
On the other hand, let’s take a careful look at WoW.
WoW are making a women’s minyan – which is muttar, (men who join the women`s minyan are the ones in the wrong). If they made it elsewhere, no one would care.
Kriya and aliyos for women in an all women minyan is muttar. Technically (Mishna says so) a woman could be called up to an Aliya!
Doing mitzva assay she`hazman gerama (tefillin and talis) is likely muttar (no diff than shofar or lulov).
So what are they technically doing wrong?
It is NOT so much the “ma’aseh” (what they are doing) but the “machshova” (intent) behind it.
They are trying to legitimize a non-Torah Judaism.
Such Jews were around since Yitias Mitzrayim. They made the EIgel HAzohov. They joined Korach. They continue in every generation.