I have two USPCompacts .40&.45 The lever on both does not cause any problems.
At first I had thoughts that in taking the safety off it might slip on down and just cause the de-cocking of the hammer.
But this has not been something that would happen in the normal movement of the finger taking the safety off.
You must really push it hard to cause the de-cocking of the hammer.
I am sure the Engineers at HK have given this a lot of thought and lots of testing.