[B1FF_PSUVM]

> why would they kill a cash machine that's proven to work so well?

You haven't been around a merger & acquisition process, I take it. It's usually like the scorpion and frog parable:

A scorpion asks a frog to carry it across a river. The frog hesitates, afraid of being stung by the scorpion, but the scorpion argues that if it did that, they would both drown. The frog considers this argument sensible and agrees to transport the scorpion. The scorpion climbs onto the frog's back and the frog begins to swim, but midway across the river, the scorpion stings the frog, dooming them both. The dying frog asks the scorpion why it stung the frog, to which the scorpion replies "I couldn't help it. It's in my nature."

(from https://en.wikipedia.org/wiki/The_Scorpion_and_the_Frog )