I didn't say professional pilots were immune to CFIT but the S92 certainly had mitigating factors and the 139 had severe operator/owner pressure, I'm not sure which 109 you refer to.
The 92 had errors in its navigational database and perhaps a crew that were too comfortable following the magenta line.
The 139 crew should have said no but pushed on using an inappropriate departure technique.
There have been far, far more GA pilots hitting the ground unintentionally over the years and the root cause is often poor weather appreciation and unnecessary risk-taking due to pressonitis.