Who says I do lock my doors? Besides, I can kill someone who is breaking into my house, but can't do much about the TSA or other baggage handlers.

I do try not to check any bags in, for ease of travel, and theft issues. I believe fancy locked bags are more likely to be burgled than my nondescript Kirkland bag. I've only had things stolen once from my bag, and that was a video camera, when they were covered as checked luggage, so you know how long ago that must have been!