Las Vegas Mass Shooting

[Lods]

And to illustrate your point Lods, Orac (aka Dr David H. Gorski) , whose blog you quoted, is accused by some as being a "vaccine industry front man". So yes, caution is required

Exactly!
(although I'm a pro vaccinator so that makes him a good man in my eyes)

The problem is researching sources and counter sources for their credentials can take an age.