Surely the opportunity costs of attacking an unsecured crowded bar over a secured sports stadium are favored toward an unsecured bar.
Recently there were posts here concerning unethical practices in software development.
https://medium.freecodecamp.com/the-code-im-still-ashamed-of...
Google somehow gets a pass on these practices for some reason. They have a lot of power and influence over the things they decide to do with the information they are volunteered. I think they should be cautious with releasing real time data on where people are congregating.