The only part of your post I agreed with was the bit about free energy crap on YouTube.
There is no great conspiracy; there never has been. If small fusion power was feasible, the company that put it on the market would clean up overnight, have an instant monopoly and would put everything else out of business instantly. This hasn't happened, ergo, the technology doesn't exist. Same for super-energy-efficient cars and so on.
Super capacitors can't replace batteries, they just don't have anywhere near the energy density of even current battery technology, which in itself is very poor compared with chemical fuel. What they do have is the ability to take charge quickly, so they could be useful for harvesting waste power in an electric car, e.g. regenerative braking. To hold enough charge to power the car continually long enough for a typical commute would require a semi-trailer's worth of capacitor space.
Yes, the sun does produce all the power we'll ever need - on average >200W/m^2 over the entire earth's surface. That's a lot of power, vastly more than we consume today. The problem is harvesting it - we can't cover the entire earth with solar panels, and if we did, they wouldn't be efficient enough with today's technology. So, since there's no grand conspiracy that we can close down, we'll just have to go back to slow but sure, scientifically tested research in labs. In other words, exactly what we are doing.