We can only speculate, my guess would be: Symbian was too much under a competitors (NOKIA's) control whereas Google/Android was seen as neutral. I have read any third-party submission to the Symbian Foundation's code base needed NOKIA's approval and that was rarely given. Symbian made hardware integration difficult, Android made it much easier and processors and RAM in smartphones had reached the level they could take up the slack of a less efficient OS.
In 2010 NOKIA and Symbian attracted more new customers than either Apple or Samsung. Not delusion, verifiable fact. In Q1 2011 Elop deprecates Symbian/MeeGo. Not delusion, verifiable fact. You should try working with facts, you'll struggle at first but I'm sure you'll the hang of it.