"In the time it takes between you pushing the button on your phone until execution, some algo bot has scuttled off under the skirting boards with half the difference anyway, most probably"
while that apparently happens in the US it doesn't happen here, or at least not through reputable brokers.
". Of course the shorters have an endless supply! "
buyers have a much more "endless" supply. You don't seem to understand that for shorts to make money they must buy back the stock at a lower price, if they don't have the market going with them they will get squeezed. Shorting isn't some magic money printer, it's incredibly difficult to do well.
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