I've a good 'decent' friend, who had to take a shit on the station platform. Because there was no other option available at the time. Some people can not hold their bowels. I'm sure he'd have surrendered to the station toilets if they were open. UK trains and stations frequently have shut or out of order toilets. I've foolishly hung on, thinking the train will be an option, only to discover it's a no can do. I'll go alfresco every time given the opportunity these days.