Anyone may believe anything they wish. But, I have lived a long life. I have studied; and met many people;spiritualists,Catholic priests,long discussions with one Rabbi.I've met witches, Wiccans' and fortune tellers. I have yet to meet anyone who can show me a demon,or a ghost,or a fairy.
Yeah for me it's quite shocking that you've grown old but still you haven't met one even thought, there are so long ago histories and researches been made.I don't yet know what i should think here.There's a whole lot coven that has been made on it even so maybe up until now you may might not have met them because you never wanted to see them,just a guess.Maybe you never willed for something deeply.Though don't take it wrong way i'm just trying to understand here.
You've said it yourself, "Insidious" is pure fiction and there are no demons out there that are similar in any way to what the movie represents. As towards their non-existence, there are different views on the matter as well as beliefs whether anything exists. Everyone is different, some may believe they do exist while others do not.
I only saw the first film, not the second. However, I thought it was the most realistic a portrayal of astral projection that anything ever has. Not the part where a demon can possess the body of an astral projector, but the astral journey itself.
It's a good detail how it's more vivid than a dream, but nothing makes sense. Why does the weeping lady not turn around and then disappears when he turns the corner? Don't know, it's just the astral. Why does the family of clown serial killers paint their faces like clowns? We may never know.
So, there are, umm, beings? Beings over there, that look strange and behave even more strangely, and they can even be mean and scary, and they can have names. But we are not the keepers of the astral census! You could try to look up the Key of Solomon and all the demons there, but the ones most accessible to you would not have names.
For example, the old lady who haunted the husband in the first movie didn't really have a name. She reminded me of Carl Jung's explanation of his own daimones (it's spelled differently, but it's the same word as demons) which is that if your conscious ego identifies as male, and you define male-ness as exclusive of the feminine, then your subconscious will take the form of a female. Same with your age, if you feel immature then your guide will be elderly.
The form of these subconscious thoughts is the psychological explanation of astral beings. Maybe the little boy in the first Insidious film was always trying to be a "good little boy" because the world was too large and chaotic for him. So, the form that appears to him (according to Jungian psychology) is an evil being who chains him up: the opposite of the boy's ego-self.
How can you name something like that? Names are for beings with parents, and a firm personality or existence, and fluency in human language.
When we bring an experience such as astral journey into the consciousness, we do need names. Basically, we make the names up, and sometimes that's good enough.
A trouble with this whole issue is that Good and Evil used to mainly mean helpful or harmful, rather than a moral judgement. Demons don't care about human morality either way. They function according to their own rule system which is very advanced. They could be good or evil as in an aid or a trouble. They are more concerned with accomplishing their goals than what a petty, young race would think of them. That being said, they do not go out of their way to harm. A lot of people's negative experiences with them are because they tried to control them or misuse them. From my own workings though, it seems they find it amusing how afraid people are of them.