Not to rain on your parade, but most people portray them as as Evil because they ARE!

Yes, the Psi Corps might have been a good idea at first, but what the corps has become by the time we are introduced to it in B5, it has become a self sustaining monstrosity, in which you are either with them, or against them.

So, if your a Psi, your options are limited: Join, physcial incarceration, or chemical lobotomy. This does not sound like an organization with the best interests of others in mind. And once in, you're whole purpose in life is to be on the lookout for people like yourself who have refused to make one of the three authorized choices above. Oh, and let us not forget that the Shadows had probobly already infiltrated deep into the Psi Corps command structure by the time they're introduced as well.

Can people be happy in the Corps? Yes. Is the Corps evil? In my opinion.

Is there a reason for the Corps? Not in its present form. Rather, the Corps should have become a testing, education, and monitoring organization, with its enforcement powers limited to the use of psi powers in the commision of crimes, or other such unethical behavior.

In fact, though we never see it, this was probobly the original intent of the Psi Corps when it was originaly chartered, before it became twisited into the organization that we've all come to know from B5.
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Vaughn doesn't know I exist. I guess this explains why the rest of reality keeps ignoring me as well. >_<