Some people, like 20% of population iirc, have trouble excreting excess salt. These folks should avoid salt. Otherwise, not gonna be an issue.
If your bp is high, cutting out salt would be a good start. Otherwise, if your numbers are good, salt away.
Processed foods and junk food will tend to have a lot of salt....I think this is where the "salt=bad" thinking came from. Tell a fatso to minimize salt intake and they'll have to cut out a lot of shit foods from their diet