Can you back that up with data?
The best post-undergrad standardized test for critical thinking skills is the LSAT. Looking at the scores broken down by major, more STEM degrees appear in the upper half, but some, like Computer Science, don't fare too well, getting beaten by many non-STEM fields.
Its worth noting that those taking the LSAT fall into the "I want to be a lawyer" category... and then please direct your attention to where "Pre law" is on the list. The scores on this list are from people self-selected for wanting to make the leap from whatever undergrad degree they had, to law school. Pre-law scores are below average because *everyone* who got a Pre Law undergrad now has to go to law school and therefore must take the LSAT. Selection bias is funny like that. Meanwhile, people with other undergrad degrees either have a deep passion/talent for law (providing the inspiration for succeeding on the LSAT) or they simply ignore law school and do whatever else it is they graduated to do.
If you picked people at random (regardless of intention of going to law school) and sat them for the LSAT, you would get useful data. Please only interpret this as tacit disagreement with the premise that your data demonstrates the value non-STEM degrees; I am not trying to comment at all on the actual value of said degrees.