I'm sick of yelling about this, but until more people listen, I'm going to keep doing it anyway.
Look twice, or maybe even three times before you turn left. Make sure you're safe to do so, regardless of whether you're driving or riding. While I suspect that most riders tend to be more cautious about turning left than cars do, that needs to change. We ALL need to be extra, doubly sure that turning left—even if we believe without a doubt that we have the right-of-way—is totally clear, and that we're not going to hit anything or anyone.
Why am I mad this time? Because I keep seeing news pieces with extremely similar headlines about how one of the founders of the metal band Mastodon, Brent Hinds, died in in a motorcycle crash in Atlanta, Georgia. Pieces with headlines that are very much like this one, from the LA Times. Or this one, from the BBC. Or, closer to home, this one, from Atlanta News First.