The answers to the test are:
1: B
2: A
3: C
4: D
5: C
Personally, I don't think so.
Every information we have is by principle, biased. We can never have a full picture on the issue (we don't live long enough to have ALL the information and all the other people's opinions) so this means that we only know a selection of relevant information. This selection biases our perception of the issue: so in this way, I think that we are bound to be at least a little bit biased.
They were wondering in search of their lost family members, they were constantly in danger, with a possibility of being killed, secretly enslaved or beaten up harshly. Their lives for sure were quite bitter even after the civil war. After all, the war could not change the point of view of the landowners in the South in a fingerclick, that required much more time and patience.