Ad hominem attacks supplanted thoughtful discussion yet again on MSNBC’s “Morning Joe.” On Monday, co-host Joe Scarborough chastised Republicans as “genuinely stupid” for criticizing President Barack Obama’s handling of the BP oil spill, adding that the GOP must think the American people are “dumb as hell.” “The Republicans blaming Obama look genuinely stupid because of eight years of deregulation,” scolded Scarborough, who is developing a penchant for favoring personal attacks over rational debate