I wasn't talking about people trying to do this but rather who easy would be for an 'evil" organization to do it if they really wanted.
People that are not interested in the few hundred dollars that you can earn by mining but on the billions in cc transactions.
If they were interested in destroying their competition, they'd have done it when Bitcoin was in its early stage. It would have been easy for them to take control of it in the first years, but now it's too late, imho.
How would these "evil" banks justify to their shareholders spending tens of millions on ASIC equipments to do something illegal?
And that would not even work, as POS coins would survive.