Electric cars are built in vain, most electricity comes from coal power
Most electricity comes from stuff other than coal power, and none from oil. Electric cars, even on a coal grid, emit less than gas cars.
require oil powered vehicles to mine
Actually, at least in Europe, most mining equipment is electric. But the costs of mining and manufacturing are much lower that the vehicle will save over its life.
copper, lithium and other chemicals which once disposed of are more toxic to the environment than the exhaust from the latest combustion engines.
This is not true, even with nasty old lead-acid. All those chemicals get recycled. 97% of lead acid batteries get recycled (the DIY EV builders are probably approaching 100% recycling rate). Tesla has already set up a system to recycle dead lithiums. There is not a lithium shortage, but all let others argue that one.
Not only that but electricity rates will have to go up as the margins of electric companies need to rise to keep up with infrastructure costs which will offset any cost savings from electric cars.
80% of all road transport could be electric powered if the cars are charged at night - no new powerplants required. The cynic in me expects electric companies to use cars as an excuse to raise rates even further.
Natural gas, hydrogen cars and mass transit are what's going to be the future of transportation, in my opinion.
Natural gas is good, but it still emits CO2.
Hydrogen has to be produced using natural gas, biofuels or electricity. In the case of natural gas and biofuels, this might make things more efficient overall by swapping engines for fuel cells. In the case of electric hydrogen production, this is worse than electric cars. Hydrogen cars in such a scenario would consume 3-4 times as much electricity per mile as electric cars, because fuel cells aren't very efficient. Biofuel production would have all the same problems as normal biofuel production - water, huge land area, etc. Hydrogen cars are also even more expensive - to build a hydrogen geo metro would cost about $100,000 right now. For that same price you could get a Tesla roadster, or build a high performance electric conversion
Mass transit is worse than electric cars. Right now, a japanese train consumes about 0.35 MJ/passenger-km = 156 watt-hours/passenger mile. A modded plugin prius from Google consumes 131.5 watt-hours/mile in city driving. A Tesla or Rav-4 consumes 250 watt-hours/mile down the highway. You should actually divide those numbers by 1.54, to produce passenger mile figures. In both cases, they are equal to or better than a train.