The nature of the multiverse is amoral, meaning it is neither good nor evil. It just is, and simply reflects back to one what is projected.
I see spirits as both projections of my own subconscious and as their own individual consciousness, in the same way that I recognise other people as existing in my universe but also as beings separate from myself.
As such, spirits have just as much nuance to their character and personality as humans do, but they will also cater to the biases held by the magician, simply because of the fact that nothing can truly be said to be separate from our own perception of it. A racist will find spirits of all kinds sharing their views, and the same with a liberal, a Christian, or a homophobe. In all cases, the spirits are simply reflecting back what is projected by the consciousness perceiving them, in my opinion.
Belial is anti authoritarian, but he will work for a fascist just as he will for a socialist. He has his own agenda just as the magicians that call upon him do, but, because every magician is a shard of the Eternal Source and god of their own universe, spirits are obliged to work for them according to the laws of this universe. It doesn’t mean he likes it or even agrees with it though.
Think of it like this: If I have certain political leanings, but my boss is at the opposite end of the spectrum, if I like the job and company I work for, then my boss’ political leanings don’t really concern me as they do not impact the job I was hired to do.
I have no doubt there are truly evil beings in this multiverse, whose only purpose is the obliteration of existence, but they too, are simply projections of the Eternal Source, as is everything else.