Investigations do more than just uncover scandals. You know how you look at someone at most of their stuff says "unknown"? The stuff that isn't is revealed because of your investigations into that person.
"Choosing to vote against this bill would be incredibly irrational if you have any interest in seeing this country thrive."-increase congressional salaries
Conversely, we could claim that high salaries are necessary to mitigate corruption and also entice more people into political careers, thus improving the distribution of our supposedly representative sample ;)
Anything you can introduce, you should support. If it doesn't appear there, you should usually oppose it, though there are a couple exceptions. Which bills each party supports are based on the IRL policies of their respective parties (with some thematically satirical alterations for the socialist party and green party)
Investigations do more than just uncover scandals. You know how you look at someone at most of their stuff says "unknown"? The stuff that isn't is revealed because of your investigations into that person.