I am resoundingly not pro-Zarek he is a self centered, hero in his own mind. BSG's Che' and deserving of as much respect (none). Felix problem is he's an idealist, idealists are often disappointed in the long haul.
The funny thing Roslin & Adama weren't wrong. There was in fact an Earth - they though were a little off and methinks there are other forces behind that. They also have worked not for their own self-interest but for the safety of humanity in the broader picture.