I don't believe any government or its representatives would place the interests of another civilisation above their own. Earth has been left out to dry by the Asgard central authority before and I find it highly unlikely there are no less than ethical influences in their policies.
Thor has gained the ability to manipulate the current SGC command. Their non-aggressive tactics for obtaining technology are also inline with what he wants the SGC to be. He has vested interests in maintaining the status quo hence is far from an impartial witness for the best interests of Earth. The appointment of the SGC command is none of the Asgard's business yet Thor involves himself, disrespecting Earth's sovereignty and obtaining the outcome that suits him best.
Thor has gained the ability to manipulate the current SGC command. Their non-aggressive tactics for obtaining technology are also inline with what he wants the SGC to be. He has vested interests in maintaining the status quo hence is far from an impartial witness for the best interests of Earth. The appointment of the SGC command is none of the Asgard's business yet Thor involves himself, disrespecting Earth's sovereignty and obtaining the outcome that suits him best.