This is just clearly assuming that H&M are in the wrong here. All of this, the interview and GK are consequences of what KP has done. Almost 4yrs of abuse and negative leaking from the palace, and GK an answer to Roya Nikkah Sunday times article.
I disagree in the sense the interview and GK were not consequences, they were choices.
As were the numerous ill advised statements and collaborations they have made.
I don't presume that H&M "should" forgive slights/hurt against them whatsoever.
That said, the allegations brought to light via book collaborations and interviews were very much damaged by a number of aspects of their "narrative" being proven to untrue or at best misleading.
Even if you take the stance "they were in the right" and everything they said was true what has that collaboration with OW/GK bought them? Peace of mind? A sense of justice/retribution?
Was that really worth the damage it's caused? Presumably to them yes...
However most people think the only winners here have been the OW/GK and the Press.
Just because you're royalty and being interviewed by the Queen of TV doesn't make airing your dirty linen in public any more classy than than a commoner doing the same on Jeremy Kyle.
It was a stupid move regardless of whether they were in the right or in the wrong - especially when they were in a really good place (new home, new baby, nexflix deal etc) to move forward in a positive way and demonstrate their credibility in their "new world" rather than use their position to denigrate their "old world" that provided the very platform for the opportunities they had been able to exploit.