There are many possible factors that explain how it can come to such a situation. Fact is, that such offset visual procedures, be they LDA or RNAV feeded, are known to be tricky. There are numerous briefings available and many required to perform such approaches, outlining the dangers, the visual illusions, the possible holes in the Swiss cheese.
What bothers me in this particular incident, is the non-reaction of the crew after recognising that something is not quite right. Many of us might have experienced a bad line-up, an initial heading for the wrong piece of concrete, a wrong approach setting, etc., at least I have. The important part is to A) recognise an error and B) mitigate it, take action.
The query by this crew about funny lights on the runway shows that they suspected something’s not right. By just continuing once the tower told them the runway was clear and only initiating a go-around on input by a taxiing aircraft and subsequently the tower, and especially how low they passed over the taxiing aircraft once started the G/A, shows how long (too long) the passivity of the crew was ongoing.
In any uncomfortable situation that is highly unprofessional and even frightening.