Matthew was an eyewitness, Jesus literally called him in person. And Mark could have copied from Matthew instead. This “genetic fallacy” or whatever you made up is purely ignorant, as people who actually knew this stuff and where it came from are the strongest and most reliable sources.
Saying “We know Mark was written first because Matthew copied from Mark” doesn’t make any sense - as Mark could just have easily copied from Matthew. And I’m the one you say doesn’t know logic? 😂