This is a very delicate topic to discuss for many reasons.
Let's try to consider the topic historically.
Anyone in power is in power because there are bases of support that allow that person to remain in power.
The High Nobility
It is extremely fair and honest to say that Nicolas II totally alienated the "dvorianstvo" and they became exceedingly hostile to him. In terms of the nobility, he simply was too liberal in their pre-1917 conception of things. So they set out, collectively or not, to destabilize him. And to a large degree, they succeeded.
L'Affaire Raspoutine.
The second base of power for the monarchy was the church, even though Peter the Great believed he had emasculated it centuries before. With the growing influence of Rasputine, and with all of the nefarious appointments he made to the clergy (there was one Metropolitan of St. Petersburg that was such a voracious lover of little boys that the Emperor was forced to send him packing), by 1916, the respectability of the church, vis-a-vis the working masses and the bourgeoisie, was in complete shambles. That surely assisted in quickening the demise of the monarchy.
The Army and The War
This is an extremely complex issue here. Nonetheless, when the Emperor replaced the Grand Duke as head of the Imperial Armies, that was a major catastrophe. The blame for disaster could only lie at the Emperor's hands. And add this to the Empress's very direct meddling in politics, by the end of 1915-1916, the Emperor had lost the real and effective support of the Army. Revolution, or at least change, became inevitable.
The Empress
The Empress had a tremenduous and serious public relations problem with the Russian people. She was perceived, by both the Nobility at Court, and the people at large, as a German, not as an Englishwoman. A majority of those close to her in the final years were either Baltic Germans, or Balts with German-sounding last names, whether or not the family had been in Russian for three-or-four hundred years did not matter in the eyes of the people. Her dealings with Rasputin caused her to be lambasted in the underground, but freely available, press, and on the occasion even newspapers subject to direct censor like Petersburg Vedemostii would find a way to print an article about her without mentioning her name or status. And yet all knew.
So yes, indeed, the Emperor, may his soul rest in peace, had a dominant role in the catastrophe that followed, the chaos that ensued in beloved in Mother Russia and the subsequent persecution of the Church.
Qui sème le vent récolte la tempête.