Both right and left wing economics are Keynsian at their roots. The Austrian model is the only one that works - economies are more organic than formulaic because they are comprised of organic components.
Maybe I misunderstood your use of left/right - it may be a symptom of context. In the US, the "right" typically fights for the right to bear arms while the left typically pushes for gun control. This is not universally true, but I suspect that more than 90% of the candidates that identify themselves as "left" are pro gun control.
The assertion regarding taxes on the wealthy is disingenuous. I have been directly affected by high tax rates and I am not in the 1%. The question is not who's hands you put money in, the question is how do you generate more money. Giving money to the poor has been proven to seize the recipients in an iron grip of dependency.
There is no FACT that taking money from business owners increases investment. When I pay the taxes I pay now I simply can't afford to pay someone else to do jobs that I can do on my own. THAT is a fact. The government is the single least efficient means for putting oney into anyones hands.
Our (US) founders knew these - they wrote that when more than 50% of the population becomes dependent on the remaining portion of the population due to government influence then their experiment would have failed.