At the same time though, Sengoku, while kinda jerkish, or at least generally uncaring about peoples emotions in general, still does seem like he has a genuine desire to bring people the advantages of science just for the sake of progress.
It seems like the only reason for why he actually wants to build his kingdom of science, is to have the assistance he needs for further progress. Actually ruling is something he dont care about.

But yes Tsukasa is more or less a madman. Or a twisted fanatic who has given himself entirely over to his own idology. Im not even completely certain why he is doing that. I guess he want to kill the seed of civlisation somehow.