People who recently uncover an idea tend to be the most zealous in promoting and defending it because it becomes part of their identity and identity is a powerful motivation for behaviors.
For example, an engineer that recently learns and implements a microservices architecture that is outspoken that it’s the one true way for building large systems, but has only used it to implement their personal blog.
See also:
- Spiritual materialism where adopting something can also lead to change in identity