Keep crying wolf and soon no one will believe you

One thing I seriously don't understand in the world of Hollywood is why some people, and it only seems to be black men, cry racism when they are let go from an acting job.

A year or so ago actor Isaiah Washington was let go from the show "Grey's Anatomy". This was around a much publicized situation where he referred to his gay co-star in a derogatory way..... after which Isaiah Washington said the real reason he was let go was because he's black.

Now Harold Perrineau, Michael from "Lost", is saying that he was killed off on the show because he is black.

First of all, when these men were hired, were they hiding the fact that they are black? Did they think the casting people did not realize they were black? If they were worried about their race being an issue, don't you think they would simply have not been hired to portray those characters?

Other actors have come and gone on both shows. When Dominic Monaghan's character Charlie was killed off on Lost I didn't hear him crying that it was because he was English. Or when Jeffery Dean Morgan, who played Denny Duquette on Grey's Anatomy, left because his character was killed off there were no accusations of the producers getting rid of him because he is single.

So how come some people feel it is okay to cry racism when, through what seems to be normal storytelling of their characters, they leave a show? I can maybe understand them not GETTING a role because of race (of course I'm not condoning hiring based on race, but I can understand the accusation). But auditioning, earning a role in a regular television series, successfully portraying that character for years, and then being let go because the character is no longer part of the story, and THEN crying racism? Sorry, that doesn't fly with me. I think it makes them look like whiners and they can only do more harm than good for black people who may have a legitimate racism grievance.