Well, all of these things...'should have done...', '...could have done...' don't take into account the feelings of ordinary people at the time.
Wallis Simpson, whom I believe was indeed badly done by, was absolutely abhorred in the UK and throughout the Commonwealth. In fact, in my family, she was hated with intense passion. Edward, of course, had been dearly loved, which made Wallis' 'crime' seem even worse.
When the British PM contacted the Australian PM for our view on a marriage arrangement which would allow Edward to remain King, the Australian PM said that the Australian people wouldn't stand for it. This was untrue! At the time, the Australian people knew absolutely nothing about it! It was deliberately kept out of the newspapers. In fact, one of my grandfathers returned to Australia from the UK, via the US, and brought with him American newspapers which were full of Wallis and Edward and all his newspapers were confiscated by Customs and the police.
Wallis Simpson was poorly treated in my view. My understanding is that it was expressly at the wishes of the then Queen, who despised Wallis and prevailed on her husband to thus humiliate Wallis. There was never any chance that anyone, anywhere, would defend Wallis or her rights, legal or otherwise. To be honest, I think that most sniggered at Wallis ('serves her right!') and were very happy that she was refused the title.