For the first post, regarding the TSA, I can tell you what I think it is. It's how you look. Seriously. When you walk out the front door of your home, the way you're dressed will determine the attention you get.
In my many years of flying since 9/11 I've been "randomly selected" twice by the TSA for extra screening. Both times were while on my way through security for early morning flights. Like "Just woke up, screw it, throw some pants and a tshirt on, I'll shave and shower when I get home." So here's scruffy looking me, looking... okay, being hungover and looking trashy to boot. Definitely going to set off some flags. Funny thing is, the first time this happened, it was a middle eastern TSA agent that pulled me aside. I actually thought it was great.
Any other time that I've flown, which is plenty, I wake up with enough time to shave, shower, dress sharp, the works - and I've never gotten the "random selection" search while gussied up. So, in short, if you set yourself up to be profiled... you're probably going to be profiled. That's not to take away from others experiences who are often profiled. They may just have really bad luck, but for myself, I blame it on looking scummy the two times I was pulled aside.
As for the second question. I don't feel that the question was directly or honestly answered. Gus usually gives very intricate answers, detailed to the bone. While he can sometimes come off as condescending, or brutish, and can sometimes take the topic of the question and derail/justify with comparisons to other cultures, he still stays on topic. This answer felt more like a plug, than an actual answer.