I think there a possible flaw in the studies & the correlation to the word "Fear".
Folks who get "startled" or send electric currents or "blink eyes rapidly" are not necessarily "fearful". And that they want (it followed) guns, etc..
There is a "fight or flight" hormone (adrenaline) that gets released MORE in some folks than others. Fight or flight mechanisms cause the electric response noted/the extra blinking of eyes/the startled effect.
Most dynamic out-performers are laden with adrenaline genetically passed to them. They are aggressive, sometimes "work focused", goal focused, and driven.
If that is the case, then any correlation to conservatives being fearful has to be evaluated in light of the adrenaline response.
Please don't get into a discussion here as to who is right. I just wanted to throw in my two cents. Having thrown it, I'm done!