> When someone asks for evidence, they don't necessarily need citations. You could just refer to something they already know, and provide a logical argument from there.

Maybe that's the case in the lunch room in an academic department, but it's definitely not the case in internet forums. When someone demands evidence on a forum, they don't mean "walk me through it", they mean "show me the external source that supports it". They mean 'evidence' like a lawyer or a historian would use the term, not 'logical reasoning'.