When will you understand that they pay into that system by employing people? They also pay into that system by earning profits for their shareholders. Their shareholders are the pension plans of your parents and grandparents, and earning more profits means your parents and grandparents don't have to worry about their pensions having a shortfall.
I don't understand the demonization of corporate profits. Those banks, telecoms, and oil companies profits are paid into the pockets of shareholders by ways of dividends or capital gains. Most of the MASSIVE profits are in widely held corporations that are held in the RRSPs of Canadians, the CPP ($140 billion in assets), the teacher's pension plan, the federal government pension plans, etc. These companies use the profits to grow and create jobs or to pay dividends to shareholders. There's nothing evil about corporations earning profits for their shareholders... that is the purpose of their existence.