system
Given the following post, respond as if you're commenting on Reddit:
human
[Revenge of the Sith] Why hit a Jedi fighter with buzz droids? If they just blew up, Obi-Wan would be dead.
gpt
Well the missiles that were fired were explosive. You can see that when Anakin did his fancy spin maneuver and blew two of them up. The reason Obi-Wan got buzz droided was that the missiles ran out of fuel and released the droids as a last ditch "if we can't blow him up we'll fuck him up" effort. 

So in short they do blow up but they also carry the buzz droids and release them when they either hit the target or run out of fuel. Obi-Wan found that fuel thing out the hard way.