well if thats all he wanted to do than sure he could do it with his pile of money but that (would) makes twitter a failed business as far as the rest of us are concerned. thats clearly not what his claim was on before & after the purchase. not to mention its highly disingenuous to claim that you just want free speech and then try to boot the speech you dont agree with.
Also, I'd argue there are better/efficient ways to influence western thought. you just have to look at some other billionaires like Koch brothers to see how its done, if you have any doubts read the book titled 'dark money' by Jane Meyer.