Stupidity
The top of the list for the Satanic Sins. The cardinal sin of
Satanism. It's too bad that stupidity isn't painful. Ignorance is one thing, but our society thrives increasingly on stupidity. It depends on people going along with whatever they are told. The media promotes a cultivated stupidity as a posture that is not only acceptable but laudable. Satanists must learn to see through the tricks and cannot afford to be stupid.
Pretentiousness
Empty posturing can be most irritating and isn't applying the cardinal rules of Lesser Magic. On equal footing with stupidity for what keeps the money in circulation these days. Everyone's made to feel like a big shot, whether they can come up with the goods or not.
Solipsism
Can be very dangerous for Satanists. Projecting your reactions, responses and sensibilities onto someone who is probably far less attuned than you are. It is the mistake of expecting people to give you the same consideration, courtesy and respect that you are naturally give them. They won't. Instead Satanists must strive to apply the dictum of "do unto others as they do unto you". It's work for most of us and requires constant diligence lest you slip into a comfortable illusion of everyone being like you. As has been said, certain utopias would be ideal in a nation of philosophers, but unfortunately (or perhaps fortunately, from a Machiavellian standpoint) we are far from that point.
Self-Deceit
It's in the Nine Satanic Statements but deserves to be repeated here. Another cardinal sin. We must not pay homage to any of the sacred cows presented to us, including the roles we are expected to play ourselves. The only time self-deceit should be entered into us is when it's fun, and with awareness. But then, it's not self-deceit!
Herd Conformity
That's obvious from a Satanic stance. It's all right to conform to a person's wishes if it ultimately benefits you. But only fools follow along with the herd, letting an impersonal entity dictate to you. The key is to choose a master wisely instead of being enslaved by the whims of the many.
Lack of Perspective
Again, this one can lead to a lot of pain for a Satanist. You must never lose sight of who and what you are , and what a threat you can be by your very existence. We are making history right now, every day. Always keep the wider historical and social picture in mind. That is an important key to both Lesser and Greater Magic. See the patterns and fit things together as you want the pieces to fall into place. Do not be swayed by the herd constraints, know that you are working on another level entirely from the rest of the world.
Forgetfulness of past Orthodoxy's
Be aware that this is one of the keys to brainwashing people into accepting something "new" and "different" when in reality it's something that was once widely accepted but is now presented in a new package. We are expected to rave about the genius of the "creator" and forget the original! This makes for a disposable society.
Counterproductive Pride
That first word is important. Pride is great up to the point you begin to throw out the baby with the bathwater. The rule of Satanism is: if it works for you, great, but when it stops working for you, you've painted yourself into a corner and the only way to get out is to say "I'm sorry, I made a mistake, I wish we could compromise somehow", then do it.
Lack of Aesthetics
This is the physical application of the Balance Factor. Aesthetics is important in Lesser Magic and should be cultivated. It is obvious that no one can collect any money off classical standards of beauty and form most of the time so they are discouraged in a consumer society, but "an eye" for beauty, for balance, is an essential Satanic tool and must be applied for greatest magical effectiveness. it's not what's supposed to be pleasing, it's what is. Aesthetics is a personal thing, reflective of one's own nature, but there are universally pleasing and harmonious configurations that should not be denied.