Keep in mind that this is the UK we’re talking about, where being “racist” is a criminal offense. The guard was, IMHO, fully justified in his hesitancy, and the prevailing conditions that engendered that hesitancy, as well as the deaths that resulted, can be laid squarely at the feet of the UK government.
Yes, the people pushing this “racism” crap and criminalizing it are the ones that should be prosecuted.