One has only to examine the history of the economy, without any erroneous assumptions, to see that raising taxes almost always causes a recession and just exasperates the recovery from a depression.
Demand-side economics sounds great when human nature is excluded from its assumptions. But the low inertia comes into play when human nature is added, causing the system to become unstable. Economic history bears this out.
Unstable systems oscillate. Sometimes this is desirable, but not in an economy.