Like pleading the fifth isn't going to raise more questions?

I understand as I'm sure everyone does that the right to take the Fifth Amendment right not to incriminate themselves, yet as this CNN article points out, all that does is raise more questions:

So which is it?

It is disappointing that Ms. Goodling has decided to withhold her important testimony from the committee as it pursues its investigation into this matter, but everybody has the constitutional right not to incriminate themselves with regard to criminal conduct," Leahy said in a written statement. "The American people are left to wonder what conduct is at the base of Ms. Goodling's concern that she may incriminate herself in connection with criminal charges if she appears before the committee under oath."

Goodling's decision to plead the Fifth Amendment "raises even more questions concerning the potential misconduct and legal violations by the administration in this ongoing scandal," said Rep. John Conyers, the Michigan Democrat who leads the House Judiciary Committee. That committee also wanted to hear Goodling's testimony on the firing.

Or...

The White House said Goodling's decision shows how political the investigation has become.

"It is unfortunate that a public servant no longer feels comfortable that they will be treated fairly in testimony in front of Congress," White House spokeswoman Dana Perino said.

Or both...