My point is that you may be paying $200 a month, but that isn't what the leasing company is receiving.
And with a regular car, the leasing company is allowed leave the externalities - such as climate change and health effects of exhaust - of their business to be paid collectively. Nothing is currently priced accordingly to its real cost, because "real cost" is impossible to measure.
That leaves two bad options: do nothing and let the markets decide based on incorrect information, or try to manipulate prices to what the government thinks (?) are the "real" ones. It doesn't help that almost everyone has a personal stake in both economy and environment, and is thus tempted to scew the results, but at least the latter option provides a possibility that various interests's concerns can be adressed.
Because this is the real problem with free-market capitalism: it assumes economic decisions are purely local, when in reality their consequences stretch to infinity. It's a necessary assumption, since otherwise every decision becomes intractable, but also means there absolutely needs to be some sort of overall coordinator correcting the relative prices of various options - for example via tax credits - to reflect distant costs, since otherwise we get a sub-optimal - possibly to the point of utter destruction - solution.