Don't forget that the Conservatives also introduced the $100,000 capital gains exemption in 1987. They also introduced the special one for farmers and small business. The increase in the inclusion rate reflected the reduction in the corporate tax rates at that time. It was a way of trying to keep the total tax on realized capital gains similar to the top tax rate on dividends.
I'm not arguing against that as a principle. What I'm saying is that right now is not the time to do it. In fact, I would have preferred a much more thoughtful approach to the whole of capital gains taxes because of the complexity of the issue, including issues like inflation.