I cannot believe what I am reading here. Are pilots really flying in known icing (ie IMC/visible moisture above the 0 deg C thermocline) in light singles with no icing clearance?
Do they have pitot heat?
Are the Static ports heated?
Are they aware of the weight of ice that might accumulate?
Are they aware of how suddenly and how quickly ice can accumulate?
Have they seen the damage chunks of ice do when they disembark?
Are they sure that control surfaces won't freeze up?
Can you accurately measure how much ice you have accumulated?
Are you sure the carb heat is still doing its job?
Maybe you can get away with playing in light icing, but you can't be sure that the next bit of cloud isn't an iceberg waiting to happen. Quite frankly IMHO icing is one of the most dangerous aspects to IF.