Isn't your second point essentially an ad hominem?
If an idea is good then the idea is good regardless of the person who came up with the idea. Same principle if the idea is bad.
If an idea is good then the idea is good regardless of the person who came up with the idea. Same principle if the idea is bad.
Or to put it another way, have you sat through a timeshare pitch to evaluate if the idea is good or bad?