Your decision or not, it was foolhardy.
In UK terms. In some other countries it is normal - you do dangerous things, you take more care doing so. Which is why I have difficulty with absolute views on this. What he did was certainly not allowed in a UK business[1] context - but was it
wrong?
I took the train to Poland from Germany last week (see the Germany on strike thread for details of how, shall we say, fraught it was). Taking the local train across from Frankfurt(Oder) to Rzepin, we got to the first small stop in Poland running wrong-line, which it seems was not announced. A mother with a small child in a basket was waiting, and once we stopped she stepped down onto the track and walked across in front of the train. The guard opened the door for her and sold her a ticket. Can you imagine that not having resulted in at the very least a stern telling off and refusal of boarding were it the UK? Quite possibly the BTP and arrest?
Different places have different standards - it is worth looking at the full picture.
It's also interesting how things progress - on a night train across Germany in the 1990s I recall a man standing waiting for us on the wrong platform, on which the displays were showing our train - oops. The member of staff on the platform gestured over to us, he stepped down and boarded on the wrong side. Completely normal back then. Was it
wrong? Or has safety simply progressed?
[1] What I do in my own house is my business, and I certainly don't adhere to all H&SAW principles when doing DIY (I do, however, at work, as I am required to do so). The results are to building regulations, but my DIY work practices when it's just me are more like what you'd see in India. My safety, my choice. Nobody else involved at all.