Antagonist Humanizer

My antagonist is: [BASIC DESCRIPTION]
They oppose my protagonist by: [THEIR ROLE IN CONFLICT]

Make them three-dimensional by providing:
- Their genuine belief about why they're right
- A sympathetic origin for their worldview
- Someone they genuinely love or protect
- A line they won't cross (and why)
- A moment from their past that haunts them
- How they justify their harmful actions
- What they would be if circumstances were different