If you want a tat, go ahead and get one. It's not any more hubris than wearing nice clothes, and getting a good haircut. Just be sure that it's something that you'll want in the decades to come. I can't see the pic for some reason, but from what it sounds like, you were in the WTC, and just made it out when they collapsed. That's probably something that you won't be likely to change your mind about. It's doesn't really make you a target overseas, unless you are planning on wearing clothes that let it become visible. If it's on your upper arm, even a short sleeve t-shirt will do nicely to cover it. And besides, you are a white guy who speaks English. That's a big bulls eye right there. Unless you maybe speak with a British accent, or can try claiming to be Canadian.
Just take care of it when you get it, especially since I'm guessing that it will have some color in it. A plain white hand lotion is one of the best things you can use to protect it while it is healing. There are some specialty tattoo balms, but they don't really work any better, but do cost 4 times the price. You don't really have to worry about getting Hep these days from any shop. the health codes in most cities (and this is NYC), plus the threat of a lawsuit if a person could prove it, keeps most places in check. Actually, I'm guessing that you know more about Hep C than anyone here except the person who has it. Both times I got mine done, they opened the single use needles in front of me. Everything was sterilized. The second one I got was a couple years ago by a buddy who was just starting out. He had to have a blood born pathogens class, to get his license. The shop he worked in used to sterilize everything with disinfectant solutions. There was no risk (or at least so small, that it wasn't even worth thinking about much less worrying) of contracting anything. The place seemed cleaner than an OR.