1) the chances of a "softer Brexit" are lower than most seem to assume. It's more complicated than MPs raising their hands once
2) chances of no deal, possibly after a short extension, are higher for the same reason - you can't just "take no deal off the table"
Some MPs are delusional, calling for what is basically the deal without the backstop
Others seem to assume the 27 will just grant an extension out of pity
And Corbyn is calling for an election