They're not. It's a popular scapegoat amidst all of the other things wrong with followers of the child molester Muhammad.

They're paranoid about everything.
That's what makes them such idiots.

They're such paranoid losers! Meanwhile, the left continues to quiver in terror over the prospect of global temperatures rising one degree in a century.

http://www.imdb.com/board/bd0000082/thread/266022275?d=266022275#266022275
https://www.scientificamerican.com/article/ominous-story-of-syria-climate-refugees/

Yes. Fear rules their heads. Fear is in their subconscious. Fear of women, terrorists, immigrants, etc.
They can be paranoid and get tunnel vision, often seeking out, what info will reinfforce their beliefs. Similar to a fascism saying. They first have the idea, then find
a narrative truth to prove it.
They post to relieve anxiety and dump their stressed anger on others. If they are thinking about, lizard people, then they watch videos that show Hillary Clinton's eyes are proof she is an evil lizard person in gov.
Avg human being
= Wants the truth. even if it is detrimetal, people generally want the true actual story.
Conservative (at least those who identify as, due to the alt-right)
= wants what's in their head to be true, regardless if they fear it, or just want it to be feared by others.
The NBP con, really believes all the mental gymnastics they argue!
"They think they are always right!"
Want a personal attack to throw at a NPD troll?
Ask how often family, women, their relationships, etc tell them
"You think you're always right!" I
It's heard throughout the lives of these people and they learn to HATE it!
Donald Trump Tribute Documentary
You've Been Trumped (2011)

Because of the jihadists that rule their heads.
https://www.scientificamerican.com/article/ominous-story-of-syria-climate-refugees/

Which makes their already outsized fear particularly laughable.

why are right wingers so paranoid about terrorism?
Because of what is happening in western part of Europe (Germany, France, Italy).
your shower is more dangerous on average in every day life than a terrorist
Very true.
I guess we have to be careful in the shower too. But that doesn't mean that other risks are overridden.
The problem with terrorism is it makes no sense go on a fun run, get blown up. Go to a night club, get shot. Go to a Christmas market, get run over.
If you have a shower, the tiles are wet etc, so it makes sense that you can get injured.
Person gets into shower, slips (because water is slippery).
Someone is angry at what a government did to their country blows up a building with people who are going to work and have nothing to do with their country and might even be a supporter of that particular country.

Why don't you try disinfecting and de-gumming your shower?

Not so much paranoid, just don't want to see it happen again.