It is true that some liberals and humanists, along with the laid-back Danes, deny the existence of evil. This is largely because they regard the word 'evil' as a device for demonising those who are really nothing more than socially unfortunate.
I'm fine, but I'm bipolar. I'm on seven medications, and I take medication three times a day. This constantly puts me in touch with the illness I have. I'm never quite allowed to be free of that for a day. It's like being a diabetic.
The cost of adding a feature isn't just the time it takes to code it. The cost also includes the addition of an obstacle to future expansion. The trick is to pick the features that don't fight each other.

