Please?

So this morning I was stuck behind a guy walking down the sidewalk that I couldn’t get around.  It was a narrow section of sidewalk and he and his buddy were taking up all of it.  I was very tempted to say, “get the f*#& out of the way please” feeling like adding please on the end made it polite.  So if I add the word please to the end of any request, does that automatically make it polite, in the same way that prefacing any statement with, “with all due respect” makes it socially acceptable no matter how insulting the following statement might be?