I don't really understand why as a tourist you'd want to use this map for a short trip, unless you were going somewhere that's a literal war zone. Most cities just aren't statistically dangerous for a tourist unless you go out looking for trouble. You're much better off applying common sense than digging through digital maps of (reported) crimes.
If I was looking for somewhere to live then it would be more interesting I think.
My wife and I will be spending a day in the Fisherman's Wharf area, and the statistics on car break-ins has me concerned, though a co-worker who lives in the Bay told me that if I'm parked in a parking garage, it's less likely I'll be a victim, as it's harder to smash-and-grab-and-go when you have to deal with a parking gate.
What is the actual car break in statistic there?
When I was looking at places to live in South Carolina, Florida and places in the Northwest like Oregon and Idaho, it was interesting to see some of the crime maps and grades these sites gave for crime.
In small coastal towns in Florida, they had small populations and were essentially tourist towns or inhabited by "snow birds" people who live in Northern states who live there during the Winter. Several of the places got D's or F's for crime. I was just shocked, but reading the footnotes, they made it clear that the numbers could be skewed because of the transit population or other factors like Spring Break revelers who come down, get in fights, people get assaulted, or sometimes killed and suddenly a small town's crime rate goes through the roof because of an outlier event that year.
It just made me leery about any statistics you see online with cool heat maps or grades they give to certain areas.
As an aside, the same thing was evident in small rural towns in the mountains in Idaho as well which also got poor grades for crime. It aligns more with your comment, it you go looking for trouble, chances are, you're going to find it.
That's part of why online forums can be nice: a well moderated one can be great at pointing out blind spots in your thinking.
Also, when on a trip, getting my phone stolen, for example, is much more of a hassle than having it stolen on the street where I live. Bonus points for thieves actually going for bags and such, so now it's likely you'll need to pay a visit to your embassy or whatever to have your passport replaced, too. In the city where I live, if my ID gets stolen, I'm likely to have at least a different form at home, and I also pretty much know where and when to go to the authorities to try to obtain a replacement.
Speaking of SF, I have no idea if my country even has any kind of representation there, where it would be, how I would get there, and how long it would take to have temporary papers made up, especially without a phone or similar device.
What counts as nearby also scales with density. Down the street is nearby in the suburbs. In New York the next avenue block may as well be another town.