Virtually every symbol and every use of symbolism has squewed and dishonest provonance.
Religion does it, nationalistic rewriting of history does it, and I guess the only countries who claim they are free from this phenomenon and young countries who have yet to build up a 'history'.....but having said that, it is only a matter of time before they also fall into the trap, so the USA is young, and hasn't a great (so far) back catalogue of myths and legends, but it will......you see it starting with the 'tea party' story, which will eventually become a myth.....you also see it with the George Washington story, the Lincoln story etc........not all stories are true and the process starts
The German National Socialist Party raided the medievel archive, the Serbian Nationalist did a similar thing.....and the Scottish back catalogue of heros and legends is mesmerising.....along with a persecution complex (OK, sometimes that come with actual persecution
So it is no suprise the St George is mythesised by England, in the same way I'm sure St Patrick wasn't a sales advisor to Guinness