And even if giants could be brought back on moder worl...

Even if the descendant of rodick (that creepy kid on the end of film) achieves somehow to find a magic bean and connect the real modern world with the world of giants on that other dimension how he would have a chance to use the giants and rule the world?
In all that modern world with all that powerful technology of humans?
I mean a few apache helicopters would make us cry about the poor giants!