Youre confusing a great many different people with very different agendas under the single title of "Jihadist Islam" -- Muslims do not form a "Them", they aren't the Borg or a hive mind (in fact Al Qaeda and ISIS don't even get along with each other)

Westerners can and do travel to Iran pretty regularly http://www.heartmybackpack.com/blog/backpacking-solo-through-iran/

http://www.ohmyroad.com/solo-female-traveller-in-iran/

http://www.cnn.com/2014/07/16/travel/motorcycling-iran/

https://www.yahoo.com/travel/solo-woman-iran-insane-our-writer-did-it-85246498597.html

http://www.lostgirlsworld.com/2012/04/10-tips-for-women-traveling-to-iran/

http://www.anekdotique.com/western-woman-in-iran/

And just for entertainment: a couple of guys each dragged life-sized crosses across Iran http://www.kw.org/pictures/countries-e-h/iran/

http://www.blessitt.com/Crosswalk_Stories_Photos/Nations/Nations