But - rather, “Therefore,” namely, because “they would not hear” (Isa 28:12).
that they might go - the designed result to those who, from a defect of the will, so far from profiting by God’s mode of instructing, “precept upon precept,” etc., made it into a stumbling-block (Hos 6:5; Hos 8:12; Mat 13:14).
go, and fall - image appropriately from “drunkards” (Isa 28:7, Isa 28:8, which they were) who in trying to “go forward fall backward.”