David, Do you see now the coincidence that Sheridan intervened in the original funeral plans for General Johnston in 1862 and the memorial in Texas that eventually took place in 1867? There was a lot of friction in Reconstruction Texas between the indigenous Unionists like Pease, the Republican Party, the occupying yankee soldiers (e.g. Sheridan) and the former Confederates (who would eventually restore the economy). It was complicated.
In a nutshell, even the pro-Union Texans got thoroughly fed up with all of the retaliation, humiliation, carpetbagging thievery, along with the unwarranted and uncivil "official" disrespect towards a longtime (Republic and Confederate) Texas hero and it galvanized people.