I wouldn't be so quick to write those majors off, they involve massive amounts of reading and writing; both skills that I heard many engineering students say they felt they were lacking in. Furthermore both of those majors score highly as well and the marginal difference is not large. I don't think that its the difficulty of engineering that lends itself to the LSAT I think it is the emphasis on problem solving and logical thinking, which is essentially what the LSAT tests.