"STEM people massively underestimate the analytical, research and problem solving capacities of humanities and soft science graduates."

Um, no.

It is the other way around: Graduates in the humanities and soft sciences massively underestimate the analytical, research and problem solving capacities of STEM graduates.

Some actual SCIENCE graduate thesis titles from McMaster:

"Proliferation resistance evaluation of CANDU reactor systems with different fuel cycles"
"Design of a System for Target Localization and Tracking in Image-Guided Radiation Therapy" 
"Heavy Metal Removal From Wastewater Using Microbial Electrolysis Cells"

Some actual ARTS graduate thesis titles from McMaster:

"A History of Vanity Fair: A Modernist Journal in America"
"The celluloid cubicle : Constructions of masculinity in 1990s office movies"
"Undead Ends: Contested Re-beginnings in Apocalyptic Film and Television"
"Claiming America Panel by Panel: Popular Culture in Asian American Comic Strips"

Case closed...