I don't believe it can't be a concern if others cause waste. There's no need to encourage more waste.
I've mixed feelings on this. I truly cannot understand the extent to which Orthodox Judaism and Haredi(Ultra Orthodox) Judaism adhere to every tiny detail of the laws, which can be interpreted in a number of ways.
For me while the laws are important,that such strict adherence would get in the way of the main tenets of religion, of what really matters.
If one becomes so obsessed, so particular about such little details to show how devout one is,I feel that what really matters, good deeds, good thoughts, good works etc, may take second place to such trappings of one's religion.
I'm not sure if that made any sense, but there's a point in there somewhere.