"Indeed he would not be permitted to vote for them if there were any reasonable way of electing a worthy man, either by organizing another party, by using the “write in” method...
Sooo...
In the current environment for example, this "grave moral obligation" to which the authors refer, actually obliges one to write-in a suitable candidate etc. IOW, it's a "grave moral obligation" in futility?? That treatise in the OP is polluted with the typical illogic of Americanism.