The toilet roll

How often is it that you walk into a public toilet or a toilet in your own home or a friends home where you get to the loo and the brown board is on the loo roll and no one has bothered to change it!What baffles me even more if that this happens in our own homes and family or friends homes where the toilet rolls are usually in arms reach in the cupboard there in the bathroom??Why do people generally leave it for the next person to change?Are people lazy?Is it beneath them?Are people too in a hurry to do other things in life VS a few seconds to change a toilet roll?I have never understood this?In a public toilet is it not strange how people feel it takes too much time to push the lever in the holder to drop the next roll?What do you think?I think that laziness plays a big part here!