Of course, the alleged "tiredness" of our players if they have to play more than 90 minutes per week, and their inability to remain uninjured for a month has already been done to death.
Are you actually an idiot or have you posted the above just to get a reaction??
When you hear that a player is 'tired', do you picture him yawning, unable to stand up and needing a glass of cocoa before cuddling up for the night? "Tired" means that the sensors they use to measure fitness, strength, oxygen levels (amongst other things), dictate that there isn't sufficient recovery period between games for them to perform at 100%. Sure they 'could' play but they wouldn't be as fast, they wouldn't last as long, and they would be susceptible to injuries.
Rugby players use different muscles, and injuries are more from impact, and less likely to effect performance.
You cannot compare rugby and football.