Reflect on the process of forming an opinion and the role of research and documentation in the process.
People have opinions about many things.  Do you really think they go out and do research and gather documentation for their opinions?  Do you?  On some things I do and some I don't.  What I definitely don't do is provide evidence, documentation, etc. to every idiot that asks for it, especially when the end result is nothing.  Waste of time. Let them do their own research.