You’re sassy today! 
Ahem: "Left-Hand Path," "Right-Hand Path," And Definitions
Some of us try, and Stephen Flowers especially did the heavy lifting on that very subject with his book Lords Of The Left-Hand Path.
To be fair, calling one thing good and its opposite bad is an almost dictionary-perfect definition of polarity. 
In fact, one argument against the conept of demons and angels is that all things are on a continuum and that such radical polarity doesn’t exist. The classic newage “Duality bad, unity good, all things are One and all is as it should be” thing.
While I have different reasons for not seeing demons and angels as at eternal war or even opposition, I mention this because it’s the most common newage reason for avoiding demonic evocation. 
Yup. Notice that the colours of this site’s branding match the 3 gunas? I don’t know how deliberate that was, but it’s interesting.
Tamasic use IMO is worship of dead cults and utter submission of that same co-creative Divine within to external parasitic entities and ideologies. but that’s another topic and already covered plenty on here.
Damn right, be up for some Belial bukkake or you ain’t getting a table in this establishment, mister!
(Only to spoil it by mentioning, I joined having NOT done any work with “demons” and several years in, have not found I needed to dilute or relinquish my core concepts and methods, simply add in a few more invisible chums and some darker powers from “beyond the clockwork mechanism” so to speak. But that’s a magnificent rant you have here. )