Not knowing, ignoring or downsizing problems that might cause great impact in a society does not mean everything is ok.
Not knowing problems is a dangerous one, because you cannot really act on what you do not know.
Ignoring problems can be even more dangerous, because you might know (agree it exists), but chose not to act upon it. It can also be compeltely the right choice to do.
Downsizing problems might be beneficial for one group, but an outright violation of rights for another group.
If not even once a person with a different skin color would try to tell all the people with another skin color that they are both equal human beings, you would and could not ever had a problem with racism., despite your thoughts about it. You might never had known there was a problem to begin with.
If not even once a person with a different skin color would agree with the fact that people with another skin color are equal human beings, racism would have kept on going forever, everywhere.