why a part of D community do not want go to D2 ?

[Don]

so wrote:
>> Sean took all the code he had written. The other minor contributors 
>> did not yet give permission for their code to be used, so of course it 
>> could not be included.
> 
> This is the single big thing on this tango vs phobos issue i never 
> understand.
> What are the reasons/motives behind this other than stupid politics? Why 
> wouldn't they give permission?

Nobody knows, apart from the people involved. They've made no statement 
(not even privately).