General taxation is unfair at lower income levels (not that I'm a fan of it at higher levels). A Canadian making minimum wage (and there are A LOT of them) earns a gross income of $20,000 per year and they're still subject to the HST of 13% on all goods and services and a 15% federal income tax. Yes, there are tax credits BUT that doesn't help the weekly grocery bill. So, when you compare comparable income strata, you get a different picture of what a 2.5% vs 13% general tax implies.
Taxation is ugly no matter what way you slice it but it's the price of having services available.