These payments they are calling support payments, not stimulus payments (the first $750 was a stimulus package before the severity of it was evident)
I don't think it's the Govs role to give you enough to make the car payments on your new car and your mortgage on your Mcmansion, or whatever lifestyle choices you have made. Enough to put a modest roof over your head and some food on the table which I think the amounts they are giving away generally allow you to do, they are not here to keep you in the lifestyle you might like in the suburb of your choice, no body forced you to overextended yourself by taking a loan out for everything.
Pensioners are about to receive $750 on top of what they normally get, which hasn't gone down at all and there is another at a later date.
Most self funded retirees have seen a hit to their super, but that's to do with the risk portfolio they have taken with it, if they had choosen cash and government bonds, it wouldn't have gone down at all, but most choose a higher risk option, as although overtime it goes up and down, on the whole it goes up more which it is likely to do again in a year or so.
I think most gripes people have are more to do with the choices they have made than a lack of government action.
And whilst I am at it, unemployment benefits only normally account for about 6% of the taxes you pay, I view it more like an insurance policy, if you never have had to claim on it ( and I haven't yet), it's generally a good thing, but that doesn't mean it's not worth having, and just because you have paid the premium for years, it doesn't mean you are entitled to something extra than the coverage/safety net you have received over that time.