Could be because I'm black, and I can identify a bit with klingons(i'm a B'Elanna, I have a temper) so therefore I see myself? Or just cuz Worf is black...No, but seriously, aren't most of the Klingons black? Well, the actors that portray them...
I'm African-American too and theres more to us than just an attitude.

It would be sad if that's the only thing we as a race bring to the table.
...and no, most of the actors that played Klingons are not black.
Be'Lanna is half Klingon/half Latina.
The majority of Klingons that are prominately featured in Trek have been played by White actors.