. . . because there is nothing wrong with the food, but if we serve you with this lovely food that you want, and then there is a 1 in 10,000 chance that you later become unwell, and then there is a 1 in 1,000 chance that you later decide to sue us, then we would not be able to sue our food supplier if we hadn't kept the produce within the precise temperature range. Its actually fine to eat and probably fresher that anything you could buy in the local convenience store. But we don't like loosing money (and we've not very good at making money either which is why you see us employing so many staff purely so that they can give food and drink away for free).
You see, we are listening to you, and you told us that you don't want to be unwell, so we're letting you travel hungry this evening so that we don't get sued by you for giving you this lovely food for free. We have another statistic somewhere which is also a big number - maybe it was the number of times we say that we're listening to you.
Thank you for telling us that you think we're useless, your opinions really do matter to us. And we're still listening, (though we won't take any action on account of anything you do say, your comments will have to go in the bin, along with the food).