Glasgow mosque leader praises extremist killer per BBC News

This BBC report http://www.bbc.com/news/uk-scotland-glasgow-west-35893123 is well worth reading as it reports something that the BBC would rather keep quiet. 

However the passage that caught my eye was this one:

'In January, The Herald reported that Glasgow Central Mosque had donated money to the orthodox group Tablighi Jamaat, which some argue promotes an extreme brand of Islam.'

'Some argue promotes an extreme brand of Islam'? No analysis, no listing of the possibly extreme views, just that bland statement. Why does the BBC continue to try to protect extremist Islamists from scrutiny? How many people employed by the BBC support such Islamist extremism?