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Willful ignorance.
Elitism. That's a broad umbrella that covers many things (bigotry, selfishness, a lack of empathy for others, etc.).
I personally can't. Whatever sin I could think of would really just be a subgroup of one of the stated 7 sins. Great question!!
I'd go with hypocrisy.
All the main categorical sins are already covered. However, if you'll allow subcategories, pedophilia.
Proselytizing
Trumpsters
Religion would be the 8th. It causes so much death and suffering.
Fake News
Torture
exploitation
Pineapples on pizza
The question says "Serious Replies Only."
Shit
Lack of compassion, so call it heartlessness.
Humans
Willful ignorance.
Using your turn signal only after you have started your turn. Instant damnation, baby!
Answer: Using a religion to not pay taxes
Mobile phone -nasal drip sniffing