Share 'Crate Vs Pannier Pseudoscience - Isaac (or Isabella) Newtons to the rescue'

What say you oh good brains pumped with blood and oxygen each morning?   My bike shop tells me I should chuck my plastic crate on the back of my bike and get a pannier.  His main reason is that when I put my bag into it (it also has two heavy kryptonite type locks attached to the crate) I am putting considerable weight right above the back wheel, hence increasing my chances of a flat with every b…