I agree that it is not unreasonable to pay some amount of tax since fuel taxes are use taxes intended to pay for road construction and maintenance. However, given a national if not global objective of reducing dependency on fossil fuels, it is reasonable that there should be some form of incentive for those making the effort to use an alternative fuel. Tax reductions or waivers are a common driver of public policy. Not everyone does this just to save a buck, and tax avoidance is not the same as intentional tax evasion.

I just don't think it's as cut and dry as you seem to conclude.