Electric car simple wondering

Personally, unless I've been mislead, it is a well established fact that cars can run great on hydrogen and that hydrogen is easily created from a renewable resource and doesn't omit the same dangers in emissions. This is one of those big "Duhs! mankind will look back on us for and see that we were so something that we knew these facts and it took us decades and decades to make the transition. Weird too that even all those "evil" terrorist producing countries are bankrupt if we switch over to hydrogen by say...end of next year?

In fact like Hitler had the common Folks-wagon designed for the common man...I believe we have government employees who could come up with and produce a dependable durable design and start production...and put these things out at a cost that covers the expenses involved so it is deficit neutral or even could include a marginal profit to help lower income tax. Private markets like Ford or Chevy could compete making whatever style and fancies they want but their would be the "citizen made" cars dependable, durable, plain, sturdy hydrogen cars no model change in years to come, just improvements and corrections...and most of the time upgrade kits would be available to people of earlier versions but the car would be the same so parts would be cheap and abundant.

But all that aside for some reason we will probably have to go through an "electric car" period because we thought of it before going hydrogen. So I'm wondering why can't an "electric car" have a small hydrogen/diesel/whatever motor driving an alternator via using advantages of multiple gears or centrifugal clutches or even hydraulic assisted alternators so this very small moped like fuel efficient engine could be used to run the alternator and keep the batteries at or nearly fully charged as a person drove down the road.

Doesn't that just make sense? Lots of good old country fishermen have electric trolling motors on their little flat bottom boat, but they also have a plywood mounted alternator and lawn mower engine...with pulleys and belt...to charge that trolling motor battery if they need to.

Same thing.