We all have real-life political and religious views that if expressed here would offend someone (Which is why they are not allowed to be expressed here -- those are the two subjects that, withe 100% certainty, start flame wars and have the mods come in with the tear gas and rubber hoses and toss suspensions around like confetti)
Character personal views/beliefs are important -- common conflicts in stories is the clash of these views/beliefs either through speech or action. TLOTR is basically Saron wanting his Ring back (His view/belief) while Frodo and the others don't want him to have it (they want to destroy the Ring -- their view/belief).
The clash of views/beliefs is where conflict comes from. A character's views/beliefs are not wrong to them -- no matter how stupid, evil, wrong, or alien it is to any other character. THEY believe they are right and the other person is wrong. A villain NEVER thinks their views/beliefs are wrong or evil -- Real History are full of people who killed millions because they followed those beliefs and thought they were right. Yet, looking back at those event, we can see they were wrong, evil, and inhumane. Yet, there are some, despite all that has happen, who still believe in those views.
The two main character in conflict are going to have different beliefs and ideas. The differences could be minor, or epic, shades of gray or stark black and white. Even among comrades who feel the same as the man character, there are going to different beliefs, thoughts and attitudes. This could lead to subplots exploring these Beliefs (See Leglos and Gimli from LOTR for an example of conflict between allied characters)
If a main character is PC, other characters can't be PC -- or there is no conflict. Without it, a story is less intresting and less deep.
Craig