I always carry a bunch of velco tape. And while I do lock my bike, I'll wrap a couple loops around a wheel and the frame, and also may wrap some around a brake level pulling it tight. My philosophy is that maybe even if they cut the lock, they may miss the black velcro and the frustration of not going anywhere all of a sudden may be enough for them to drop it and skedaddle in confusion. Thieves do not like to spend much time at the scene once the crime is initiated.