Tet was a disaster for the US because the public had been led to believe we were almost done; an attack of that scale (as costly as it was for the communists) was supposed to be beyond their means. The communists didn’t have to WIN battles - just fight them until the foreigners (French, US, Red Chinese) got tired and left.
The public was full of liberal college professors who pushed the anti war BS. I recall that very well. The VC and NVA got their you know what kicked during TET 68. I recall voting in late 68. The SF NCO’s and many officers voted for Wallace as we wanted the bombs.
Or more likely, wait until the pro-communist demonstrators (assisted by our media)wore down the people at home.