Lies. An ayatollah is clergy. Khomeini was a high cleric and state leader of an Islamic Republic. Muslims around the world responded favorably to the fatwa. So favorably in fact, that 30 YEARS AFTER IT WAS ISSUED, someone carried it out.There is no Islamic clergy, thus no universally accepted rule to determine who can emit a fatwa, which is not a religious order as you said, but a legal opinion.
The partial decentralization of sunni Islam is why you can have different muftis emit contradictory fatwas.
The Supreme Leader of Iran emitted the fatwa on Rushdie and it holds no legal or religious weight for most Muslim states in the world and even less for their inhabitants.
I fail to see how this attack is a burden Muslims around the world should bear
@TrapParis is right. It's ridiculous to condemn random followers for any heinous act.
White supremacism is a decentralized ideology as well. Should WS leaders bear no responsibility for the murders that happen as a result of their rhetoric?