I think you probably are slightly misunderstanding how the testing works here tbh.
He didn't fail two in a month (and he wouldn't have been tested twice because you'd be bound to fail the second one after having failed the first without having taken anything else), he failed it for the second time that month having failed one at some unknown point before it. We also don't know when he failed the second test, nor what he failed it for, because the ECB hushed it up. We do know that the ECB do hair tests, however, and we do know that most drugs are detectable in hair for about 90 days and that he was cleared to play again by 3 May. Knowing all that it's possible that he took whatever he took 3/4 months before we all found out about it taking us back to January. The moralities of taking recreational drugs aside it's hardly a greater sign of lack of commitment or focus than him having gone out on the piss in the off season would have been.
As a wider point, I'm a little bit sceptical of the ECB's handling of this.
Everyone could have told you that about Hales years before it all came out. I posted about it on here about 3/4 years ago and said in detail how he was avoiding getting caught (shaving his hair off after using). He was a notorious user of recreational drugs throughout his time around the Nottingham and England dressing rooms and it didn't stop him being picked, nor was it going to until the media caught wind of why he wasn't playing and broke the story. There is some suggestion that the selectors didn't know and Hales didn't tell his teammates, but some people in the ECB clearly did and were either unfazed by it or willing to turn a blind eye to it as long as they felt it could be hushed up. I find the idea that none of his teammates had any clue when I, a random bloke on the internet, did to be implausible to the extreme it strikes me as their own attempts to distance themselves from the PR backlash.
He might not be a very nice bloke, few sportsmen are, but he's missed a World Cup and a near year of international cricket because of it. I can't help but think he's served his time.