There's different kinds of bias/activism.
1. Publishing an opinion with facts (blog post/activism)
2. Publishing only the facts that support your political opinion without your political opinion.
3. Publishing all the facts but only while investigating the people you disagree with (not the people you agree with)
4. Investigating all the facts to settle publicly made allegations by politicians or political figures.
So while 1/2/3 might be seen as activism -- #4 is not. If people make the claim that the IRS is toothless when it comes to enforcement of tax collections on large corporations -- finding out the facts is a good way to help settle public debate.