It's not about you. It has to do with the credibility of the source. Unless it's someone like Shefter, Glazer, King, etc. They aren't credible without saying who their source is.
If you want to believe every Twatter with a checkmark is credible, that's fine. Most of us don't. You say multiple sources. It isn't an insult that we asked you to show us which sources is it? It is a fair question to ask, IMO.
Also, conventional forum etiquette is the one making the claim has the burdon. It isn't up to us to track down the info.