Many of us on here take the view, based on experience working with them, that they’re just beings, and that they were all painted as evil during the Christian era 9though it cannot be denied some demons are harmful, and some spirits are innately malevolent).
The modern method of evocation we talk about a lot on here tends to emphasise the idea they are just beings, with agendas, not cosmic poison. For that reason I use methods of evocation like this: