I'm not talking about terrorism, that quote is not about terrorism, but about support for shariah.

I'm asking muslim columnists  to be clear on whether or not they agree with those majorities of Muslim who long for shariah law in matters such as adultery, or punishment for theft, etc., or regarding gender segregation and the injunction not to socialize with men outside their family, or against making friends with non-Muslims, etc., all those aspects that make people wary of Islam. 

That isn't asking for "allegiance", it is asking what their positions on those issues are.

Clearing that up would do wonders, in fact it is the only thing that could, but can they? If so, why don't they do it?

I'd feel a lot better if I were sure my non-Muslim male neighbour was refraining from killing me because he had no urge to do so, not just because it is against the law, but maybe that's just me?