There is of course a middle point here... "oh, I don't like this guy and he's incompetent enough so that I can be a little evil to him without risking any consecuence".
I'm guessing the risk was asymetric for SoftBank vs KSA. SoftBank probably made a ton of money guaranteed by the deals, plus the chance to make a ton more if they worked out.
KSA only makes money if it works out, and it's not.
> "Never attribute to malice that which can be adequately explained by incompetence."