I don't know how evident it is in the West, but what you mentioned for the US is very true, not just for Arab countries but also South Asian and African visitor

I don't know how evident it is in the West, but what you mentioned for the US is very true, not just for Arab countries but also South Asian and African visitors. Around more than a decade back, when our school had planned for a trip to NASA, I remember the teachers and the visa guide aggressively asking all the students who had applied to scrub anything political off their social media and their public profiles elsewhere. The US visa officials are also the most hostile lot, and while I didn't experience much hassle during my interview (I guess because I worked in a white shoe firm which was sponsoring the visa), I was witness to seeing a Sikh family get intensely rattled and rammed during their process.