[Avalon Memories]

Congressional hearings are the most useless of endeavors. Full of sound and fury and signifying nothing.

Exactly. The point seems to be to give congress critters a chance to grandstand and pretend like they are actually accomplishing something. With apologies to Shakespeare for this paraphrase:

Congress critters are but walking shadows, poor players

That strut and fret their hour upon the stage

And then are heard no more. It is a tale

Told by idiots, full of sound and fury,

Signifying nothing.

[FreeReign]

The point seems to be to give congress critters a chance to grandstand and pretend like they are actually accomplishing something. With apologies to Shakespeare for this paraphrase:

Congressional investigations are supposed to expose wrong doing.

The DOJ is supposed to prosecute it.

It's the latter that's not doing its job.