Maybe Mordacai can help resolve this issue, but I don't believe they have a choice regarding the commons. The commons represent an ownership interest. If the company is worth something (assets > debts) then the commons have value. Canceling would be like stealing.
But if the company is not worth something (assets < debts) then the commons lose out. I believe under this scenario, shareholders must lose all before creditors lose any.
So these shares may become worthless during the bankruptcy process, but it's not a choice some lawyer or executive makes.
I can forgive a pink that lies to me, but I can't forgive a pink whose lies I believed.