Powerful F

Out of all the letters in the alphabet, I think that the "F" is the most powerful. It is the first letter for Fame, Fortune, Freedom, Faith and even Failure. There is one word that it starts with, that makes a difference to the other three letters that follow it. Why can we say luck, duck, puck, suck, muck, buck or tuck and no one flinches? They are all acceptable. Plain old non confrontational words. When we put the "F" before those three other innocent letters, there is trouble. Who gave the "F" so much power that by placing it in front of "uck" , you can be reprimanded, assaulted or thrown out of places?