So, as much as it is a symbol of balance, it's also historically a tool used by Christians (or more accurately their kings) to paint their targets as 'evil' or 'demonic'.

Honestly, this is a really important takeaway. A whole lot of satanism/demon worshipping fears come down to this: rather than being a legitimate concern, it's largely just a tool used to villianize others and play on the preconceptions of Christians.