It's basically the same process, mathematically.

\rant

Each level up increases the concentration of toxin because the n-th level is eating the (n-1) level which has a higher concentration than the (n-2) level that the (n-1) ate.

Similarly, if we posit that all else being equal [1] a sociopath is more likely to go up a hierarchical level, then the nth level is promoted from the n-1 level that is more sociopathic than the n-2.

I also believe that presidential democracies are more prone to this concentration of sociopaths because voting the higher offices is more divorced from the voter (ie you dont know who you are voting for personally and are more easily mislead). Parliamentary (or congressional seats) democracy is more resistant to psychos. Monarchies are immune (except for genetic inheritance), but of course come with their own set of problems.

\rant

[1] a similar assumption is made for toxins.