Bishop Fisher's household? HVIII had at least as much motivation as Fisher was arguing against his divorce. And of course HVIII eventually executed Fisher, and Thomas More, and other stand-outs against the divorce/Supreme Head of the Church business.
en.wikipedia.org/wiki/Richard_Roose
Chapuys originally suggested this possibility to the Emperor in his March letter, telling Charles that "the king has done well to show dissatisfaction at this; nevertheless, he cannot wholly avoid some suspicion, if not against himself, whom I think too good to do such a thing, at least against the lady and her father".[30][41] The ambassador seems to have believed that, while it was unlikely that the king, being above such things, had been involved in the conspiracy, Boleyn was a different matter. The medievalist Alastair Bellany argues that, to contemporaries, while the involvement of the King in such an affair would have been incredible, "poisoning was a crime perfectly suited to an upstart courtier or an ambitious whore"[42] such as she was portrayed by her enemies.[42]
Allegations by people who disliked her - some referred to her as the goggle-eyed whore and of course she was blamed for HVIII wanting to set aside K of A. Chapuys of course was a massive K of A supporter.
It was also alleged later that she had poisoned K of A - but given the isolation of K of A in the Midlands, Anne would have had difficulty accessing her and no need to anyway, given HVIII had no intention of going back to his ex-wife.
We all have theoretical motives for all kinds of crimes. That doesn't mean that we commit them - motive, method, opportunity are all required. Hundreds of clergy were against HVIII marrying Anne - she couldn't (and manifestly didn't) knock 'em all off.