This is a reasonable question, but at the present moment people pretend that the manufactured doubts, e.g. about climate change, are tantamount to real doubts,

This is a reasonable question, but at the present moment people pretend that the manufactured doubts, e.g. about climate change, are tantamount to real doubts, when they aren't. We live in an atmosphere where doubt, disinformation, and confusion is an active strategy. It isn't even so much about claiming "alternative facts" as it is keeping people triggered. I would recommend watching "Hypernormalisation" by Adam Curtis to understand what is going on.