They’re in denial that this happens (arguably, it didn’t happen, as eventually Tesco lost, and they wouldn’t know about it in the three years Tesco was winning because The Telegraph/Mail etc. wouldn’t report on that).
They think worse things would always happen under other systems (e.g. everyone would be a slave of the state and go to gulag if they complained about anything).
They don’t see it as an inherent problem with capitalism (e.g. simply make doing this illegal, and refuse to let business lobby to reverse the decision, and everything’s fine).
They think this is a good thing (e.g. the fired workers will be incentivised to work harder, then earn a payrise, and use the extra 10p an hour to start a competing multibillion pound supermarket chain).