The investment in Saving Certificates and returns are not haram or "sood" because the govt uses that money to run the country and various projects and the money gets circulated into the economy, creates jobs and makes lives better.
Similarly investments in the banks and profits earned are not haram, because banks do business with the money, which creates jobs and the money is also circulated into economy.
The sood is haram when individual lenders lend to individuals and survive on the interest only. Though in that case a businessman might borrow money, do business with it, make profit and repay the loan with interest. That interest which the lender taking is haram.
But if both the parties agree that the lender becomes sleeping partner the returns on the investments are shared according to agreed formula then it is halal.
In Pakistan nobody is forced to take profit, if he she thinks its against his her beliefs. You cannot and should not judge others and issue fatwas here as you are not a mufti or aalim.