...because it is different? If you're a small fry, you hurt fewer people, and any claims that it's a survival necessity are at least plausible. It's also quite likely that people you hurt are actually worse than you, as is possible with Greedo.

If you do the same as the director of FBI, _excuse me_, Lord of the Sith, things are quite different.

Edit: but also, Uber and Kalanick were never small fries. So that's where it breaks down.