So, for instance, how does a tradesman compare? The median income for somebody with a BS, employed full time, is $69k [1]. The median income for a plumber is $60k. [2] That's already pretty close, especially once you factor in 4 years of extra earnings vs 6 figures of debt. The BS may overcome the hole relatively late in their career, but again - it's close. However, there's a big catch: those numbers included STEM degrees. Remove STEM degrees and this isn't even close anymore.
I'm not arguing everybody should be a plumber, or anything of the sort. I am saying that college is a decision that should not be taken lightly, especially if somebody is not going to pursue STEM.
[1] - https://www.bls.gov/emp/chart-unemployment-earnings-educatio...
[2] - https://www.bls.gov/ooh/construction-and-extraction/plumbers...