I graduated from an Ivy League university with a degree in  political science and have never heard of the theory of "rational irrationality".  I don't think its author qualifies as a leading light in the field and it's a newer fad that hardly qualifies as "current scientific consensus".  Public choice theory is something an undergraduate might come across in a course on political economics, or might not.  The connection to voter registration remains unclear.  

"Democracy works better when more people participate" is axiomatic.  With a larger sample size, statistical anomalies are smoothed out and you have a greater chance of representing the whole to a greater degree of accuracy.  

The divine right of Kings is pretty much the exact opposite of what Jefferson was getting at in the Declaration.  Equating it with Lockian and Jeffersonian ideals is, frankly, bizarre.