Gutters everywhere are uniting. Icicles are not the fault of gutters and they are tired of getting all the blame. Heat loss is the number one reason for ice damning and icicles. You need a few things to have icicles. Snow covered roof, and enough heat loss from the main house to make that snow melt. The diagram shows it. Insulation value at the eave is at its worst, and is the number one area for heat loss. Snow melts, then freezes at the overhang. Ice builds up, fills the gutters, and eventually can lift shingles, causing extensive water damage inside the home. Certinspectors can inspect this problem and give you a prescription on how to solve this problem once and for all. Stop blaming the gutters, its not their fault.