Why can't opposition MPs be advisers to grassroots bodies, PA?

Just cos someone's an opp MP doesn't mean that he doesn't support all Govt policies. Ignoring them when appointing grassroots advisers is a gross generalisation bordering on xenophobia. This is PA shooting themselves in the foot, an open admission of a subjective, selective, sycophantic policy of key appointments in a non-partisan entity. MPs're elected by the people, opp or not; who's PA to say they're unfit?

http://www.straitstimes.com/STForum/Story/STIStory_707744.html