In such cases it is reasonable to have a proper calm discussion, not to ban those asking the question.
But the real reason there is outrage about this story is because BLM organizations received hundreds of millions of Dollars in donations in 2020, and it seems highly improbable that a long-time activist has somehow saved up enough to afford multiple millions in real estate purchases. Several BLM chapters rejected the foundation's offers last year and instead issued a public call for increased transparency, claiming they had received almost no funding over the years from the parent organization (https://www.latimes.com/world-nation/story/2021-02-23/ap-exc...). All this suggests there is corruption or grifting happening.