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> They are looking for information, they should question the person who can answer those the best.

I disagree. Calling the CEO to testify puts the chief decision-maker on notice that these are issues he needs to focus on. Settling for a minor executive won't have the same influence on the CEO. Secondly, a minor executive has much more ability to dodge and evade, since he can legitimately claim "this isn't my area," "wasn't my decision," etc. Also, like I said before, settling for interviewing minor players doesn't attract the public's attention to the issue.

> If congress wants to take these issues seriously they should drop the politics

Congress is politics. It's not some technocratic regulatory body. Engaging in politics is literally the primary job of congressmen.