Actually, rwam said that Zimmerman probably acted on prejudice based on race. Rwam is claiming that's not racism. It is, though.
I think you and I have different interpretations of the word 'racism', Celia. Technically, yours is probably more right than mine. If you have a prejudice based on someone's race, that's technically a form of racism. However, when I throw the word 'racism' around, I'm using it to mean "hate based upon race". So, when I say I think Zimmerman's view of Trayvon (a black kid wearing a hoodie looking suspicious) was probably prejudiced, I'm also saying I don't think it proves he also hated Trayvon just because he was black. Again, just my opinion, and nope, whether the killing was rooted in prejudice or racism doesn't wipe away the pain Trayvon's family feels right now, nor does it absolve the injustice.