You seriously think that those foreigners with no permission to be here, regardless of the length of time, should not be arrested and dealt with? What do think should happen to them when discovered, told "Tut, tut, overstay, never mind, off you go" so that there would be no need for anyone to ever get a visa/extension?
Perhaps your rationalisation is that those on overstay should be left alone with no consequences and those legal foreigners who do renew their extensions should just have to get on with it?