So I am guessing that China and Singapore have implemented such enormous taxes and fees in part, at least, to discourage a buildup of vehicles? By making them prohibitively expensive, and by limiting their service life, they think to slow the rate of growth of personal vehicle ownership, which (theoretically) reduces congestion (not that there isn't any, but maybe it would be worse?), slows the need to create expensive new infrastructure, and (slightly) reduces vehicle-related air pollution?
Or, in the case of China at least, is it a protectionist measure? The non-Chinese products will be priced out of reach of the vast majority of would-be owners, where Kailun and other domestic brands can be had for much more modest prices? I don't expect Singapore has much of a vehicle manufacturing base in their economy, do they?
Or, is it purely a money-grab on the part of the government?