@PotteringPondering
Yes, I absolutely do. Occultism and folklore are filled with accounts/experiences of entities that are either entirely malevolent (or at least considered so from a human perspective) or, if not one hundred percent malevolent in nature, are certainly capable of and willing to do malevolent acts if they feel it's justified (sometimes for what we humans would consider very minor things.)
Underlying the general pagan and occult worldview is that the spirit worlds/other worlds are diverse - as diverse as this own planet - and they are populated by many different kinds of entities.
Fairy folklore is full of unpleasant behaviour from fairies of all types. Some fairies, such as the Red Caps, are considered to be entirely malevolent in nature, inclined to abduct and kill humans for no other reason than that they feel like it.
There are other more benevolent fairies, which can be helpful and friendly to humans if they wish to, but they will commit cruel acts against humans if they feel offended or slighted by the humans in question (and the offensive acts do not need to be intentional; they can be totally unintentional.) Fairies have their own system of etiquette and failure by humans to adhere to it can result in some degree of harm (at absolute worst, death) even from fairies that are considered to be of a more kinder nature.
That doesn't stop some pagans and occultists from seeking to develop relationships with fairies and work with them - there can be benefits - but as people like Morgan Daimler often reiterate, there are always risks and people need to be aware of those risks and of the expectations that fairies have of humans.