You are coming across as being disingenuous, I fear. A side of the truth is just a part of it, but using "side" instead conveys the complex aftereffects that revealing a part of some data (the "truth", if you will) can have.
If you have damaging data on two people who are enemies of each other, publishing dirt on one but not the other is helping the other person -- taking a side, IOW.
If you have damaging data on two people who are enemies of each other, publishing dirt on one but not the other is helping the other person -- taking a side, IOW.