You see, I don't agree with your classification of this as 'arrogance and competitiveness' - I appreciate it is only supposition that this was going on outside of this one instance, but then it's only supposition to assume it was a one-off - if this was a prolonged period of ball-tampering in a manner more brazen (and presumably effective) than any other that has ever been brought to light, this is a much greater fraud - to my mind as a fan- than some no-balls bowled to order that don't substantively impact the outcome of the game.
But, I also take @BRM's point below that the impact of the tampering may be being overstated but in the context of a close game one key wicket because of greater-than-expected reverse swing could be enormous. And we have to assume that if they were doing it, they were expecting some sort of result/benefit.
As I said before, it's impossible to know what a fair punishment is here - or even what a reasonable position to take on the matter is - without knowing how wide-spread this is throughout the game (have Eng/SA/india been bringing foreign objects onto the pitch to impact the condition of the ball? I imagine we'll find out in ~10 years time if they have) and for how long Australia were doing it. To my mine the only reasonable comparable from the examples you love listing is the kiwis with the bottle top and that was 30 years ago, the game has changed a lot since then.
But, I don't think this is an invalid conversation to be having and the defensive position of 'everyone's been doing it, they've been adequately punished, it's just competitive arrogance' doesn't sit right.
Anyway, Steve Smith may well be the best batsman of this generation and its a joy to watch him work at the moment. I just hope Archer has some answers at Lords...