They weren't killing the Buddha they met at the museum. In fact they never met the Buddha before them.
Kirt
"Set your heart on virtue: Virtue's outcome is delight". Dharmapada 9:3 “All beings are Buddhas, but obscured by incidental stains. When those have been removed, there is Buddhahood.” Hevajra Tantra
2 – Muslim (832) narrated from ‘Urwah ibn ‘Abasah that he said to the Prophet (peace and blessings of Allaah be upon him): “With what were you sent?” He said, “I was sent to uphold the ties of kinship, to break the idols, and so that Allaah would be worshipped alone with no partner or associate.” http://islamqa.info/en/ref/20894