Mainly because those who are supposed lead, and to either understand or listen to those who understand what exponential increase really means ... have not. Instead it's been dithering and mumbling procrastination, and now we are told the time is right to start clamping down when ... no ... the time is wrong, it should have been done well before now, before the runaway got going. Later they will say "Well, nobody could have known" ... cr@p, plenty of people have known, if only they had listened. They wait until they know for certain the fire has taken hold, and then when they realise it has ... oh my goodness me ... we can't put it out!