Folks defending Brady and dismissing his actions as harmless should engage in a simple exercise:
Ask yourself how you would perceive this situation - a player under contract with their current team engaging in specific, detailed, and ongoing contract discussions with a division rival over the course of 4-6+ months, beginning during training camp and continuing throughout the entirety of the regular and post season - if that player was Aaron Rodgers.
I'd be curious what thoughts and feelings such a scenario would evoke. Perhaps I'm wrong, but my sense is that Rodgers would be (rightfully) lambasted by nearly poster here, and if this hypothetical scenario had happened during the year 2015, for instance, I'd imagine there would be a frequent narrative along the lines of: "Can you imagine Brady doing THIS type of thing? Sleazy backdoor meetings on yachts? Throwing in the towel on his current team? No way! That's what sets him apart from Rodgers, that's what makes Brady the GOAT, that's the mentality, discipline, and outlook that makes him so good! Brady has character. Rodgers is an ego-driven diva who only cares about himself."
And I'd agree with that; I'd be one of the people saying those things because I think that's all true. If you have presented me with this situation as a hypothetical, before it happened, and asked me if Brady would be above doing this type of thing, I would have said "yes, he is". I'm disappointed that I was wrong, not because I feel personally wronged by Tom Brady, but because what he did was lousy.