I believe it endeavours to do so, but I think it only does it partially because of the $2,000 tax credit limit. In particular, there's a big difference between a family earning $100,000 per year as a single income earner and two $50,000 income earners. The big discrepancy between income tax payable in a lot of average families like that I don't think is necessarily rectified by the $2,000 tax credit limit.
On May 28th, 2015. See this statement in context.