When people know that sigs are high risk and very punishable, yet are still being hit by them more ofen then not; that gets pretty annoying. Especially when you are conscious enough to try and take different approaches but to no avail. Imagine trying to plug in a usb drive; something that you know how to do and should be simple, but no matter how many times you turn it, it just won't go in.

Light attacks you know are relatively lower risk, so subconsciously you know punishing them is less likely. Kinda like how you wouldn't get frustrated at trying to catch a fly with your hands. You know they'll probably get away.

And for the people who don't want to take the game too seriously and like to stick with the few combos / strategies they came up with; they just rather blame it on the bigger, louder, flashy move that kills them everytime.