As a lone worker he would have been advised not to attend without full police support.While I fully understand your argument, the implication is that the PCSO was waiting for back-up, but failed to communicate this.
Do you know if this is the case? As a PCSO, he isn't required to attend those incidents anyway. So if he had said 'I'm waiting for back-up', it wouldn't have been true, would it?
Once police are on the scene a PCSO can assist.