Because losing Leah McLaren is such a loss (not).  After  her column   “The joy (and politics) of breastfeeding someone else’s baby,”  it was a wonder she was brought back on board after her brief  suspension.  
Also both these opinion writers are freelance.  Can you "let go" freelance writers or can you just say you aren't interested in what they are selling?  They might have better luck at the Torstar after all most of their columnists share the same "out to lunch" opinions.