I guess you missed the USA vs UK season. Or the fact that there has been more than a few non-american competitors sprinkled in more than a few shows.
Here's a fact that might chap your little Irish behind. Fighters come to the States & Canada (to an extent)because:
A) the level of competition and training are light years ahead of the rest of the world with the exception of Brazil and Japan.

the abundant training oportunities.
C) the availability of higher competative events with a good chance of getting exposure.
I've fought two Irishman, a Brit, and Aussie and a Frenchie to date. Not saying that not being American was why they lost. And I'd never question their heart. But they had holes in there ground and striking games that you could move herds of cattle through. And they were all considered top competition in their respective countries. And I was fighting them as an amateur takeing them on in pro-am competition.
On a side note. I'd say Richards not so subtle quasi-not-quite insult was basically fair play. Your posting on here is always fairly well thought out. So I am of a mind to say that you knew you were going to be offending some Americans with that comment. Including a decorated ten year military vet honorably discharged from his countries services for wounds aquired in combat.