I believe all senators are complicit in the scandal that is deflecting attention from serious issues that Parliament should be dealing with. Their complicity began on the day they accepted appointments to the Senate as representatives of parties.
They all act in a partisan manner, rubber-stamping legislation if the party that appointed them is in power and opposing legislation when the party which appointed them is in opposition. This makes a sham of the role they are to play in scrutinizing legislation passed in the Commons to make sure it passes muster.
Instead, they use their sinecures in the Senate to manage campaigns, raise funds and plot election strategies for their parties, much at taxpayers' expense. This is where the senators' shame lies.
However, there is a way they could redeem themselves. They could hold a ceremony in which one by one they hold up their party membership cards and burn them. Then they could take an oath to sever all ties with all political parties as long as they are drawing benefits as senators.