In general, I agree with you. But there is some nuance here. Some of us really do have devils whispering in our ears. We do not always have the agency to make correct decisions.
Responsibility takes different forms. Somebody took my body and I'm left holding the consequences. No one is going to clean up this mess and I have to deal with it. Personally, I was shocked how many of friends understood what happened and offered their support. Those that understood made no attempt to "hold me responsible" for my actions.
It's also a way to forgive yourself, and others, more easily. Don't get me wrong, I think it's fantastic to take responsibility, and I believe society would be so much better for it. But in some circumstances, some people are simply bound to fail: there are limits to how perfect one can be.
I suppose we can set aside the special case where genuinely malign & vicious devils would really exist, and be in position of truly wrecking havoc!
Demonology: The non-science that involves programming one's own consciousness using techniques developed in computational regard for the nervous system.
Demonlogy most often has a theme of destroying one's enemies: Precisely because you separate your consciousness into small spirits you become able strategically CRUSADE the enemies of yer Agency within.
That will not apply to those who know not what they want, EG purpose of life; values; virtue ethics etc. similar systems. One who has no agency will not have any power within.
Traditional christian interpretation makes no sense to me whatsoever unless one believes they are god; but the bible actually is perfect, for let the religion and spiritualism be God and let yourself be Jesus, and then you kill god as whole, EG all three parts like Nietsche; then you will be able to raise Jesusesque!
This line of makes reincarnation myths insane, because analogy then is; your decide your values and you die that is decide them again and this repeats forever such that the only choice is to not to decide the values. I have not thought about this view yet...
So we should not "blame the Devil". We should blame the people who do the Devil's work or let it continue.
For instance slavery. Was it Devil that enslaved all the kidnapped people? No, it was Devil's co-conspirators, the slave-owners.
"Devil" is a social concept and construct, and a very important one. It's not much different from asking "What would Jesus Do?"