I recall a trip to Seattle a few years ago. We rode the ferry from Bremerton over to Seattle in the morning, to do the tourist thing along the waterfront. Early in the morning wasn't too bad: lots of tourists, some commuters, a couple of sleepy vagrants, and one pothead rolling a joint outside the shops. No big deal. We ate lunch at Ivers and wandered our way up to Pikes Place Market. By then the three year old boy was tired, and I was carrying him around... thinking "this is a bad place to be carrying strong side, with my arms and hands mostly occupied."
Fast forward a bit, and it's pushing into afternoon. We are making our way back down to the waterfront through one of the many twisty stairwells, and we run across a lady with seven or eight purses/bags, spread out on the steps, and she's obviously higher than a kite. My discomfort level went up another notch, but the woman ignored us.
Eventually we got back to the waterfront, and headed back for the dock where the ferry was. On the way, I noticed a fellow on some high ground, overlooking the sidewalk, that had the distinct look of a predator surveying the crowds walking below. He wasn't the only one that had that look, but I distinctly remember looking right at him, and I am pretty sure he knew that I knew what he was looking for. You could really tell, as the day drug on, when the local riffraff started waking up and making their rounds. I'm not a LEO or anything, but I made a decision a long time ago to avoid being easy prey. I'm fairly certain that most of the hippies/druggies/vagrants we bumped into that day were harmless... but they all are, until they are not.
To top it all off, the 3 year old boy was playing Indian Jones between the seats on the top deck of the ferry, in shorts, and crashed and burned both knees on the non-skid deck. And all I had to patch him up was a single bandana folded in my back pocket. Lessons learned that day.