Granted, people could always trip over your cable without any fault of your own, but at that rate, anyone could always come over and spill stuff on your laptop as well. Moot point.
By that logic, why bother with a seat belt when someone could always shoot me in the face?
If you have to code for IE6 you can't use transparent PNGs can you?
You can -- it's just inconvenient.
Or, if you're going to go the route of ringtones, make them really annoying ringtones, like I do.
Achy Breaky Heart. Hold On. Islands in the Stream.
I could go on.
if we take the reverse case, particles being incapable of free will would seem to imply that we oursleves don't have free will.
A gas tank is incapable of getting you down the street, therefore your car is incapable of getting you down the street?
When all else fails, read the instructions.