The Baha’is desecrated the grave of Diya’u’llah, the son of Baha’u’llah who was buried alongside his father, calling it ‘purification’ and ‘cleansing’. Next they build this huge building in the vicinity for his other son. It is just karma that this happened.
Abdul Baha did not even consider Diya’u’llah a covenant breaker. He is not mentioned in his Will and Testament. Only Shoghi Effendi later made him a covenant breaker, so only then did they remove his grave.
I doubt that Abdul Baha, who only saw himself as a servant, would want an enormous shrine like this. I also doubt that he deserves it, considering the way he treated his family.
And on top of all, nobody actually died. The only thing that happened was that the Baha’is lost money and their reputation got damaged.