I mean only player with bot will backsnipe LMD CS without any other type of defence. Real live person will provide information to ally about incoming CS.
Well with LMD you are limiting the defender to solely that. And that's exactly the point. Plus, you can arrange situations in which front-sniping is just impossible. Other way, is as mentioned before, exploiting people's offline times. This is worsened in worlds with fast unit speed, where often alarms go off after attacks have landed... what do you do in these cases?
If "many players" find it easy. Why they dont use that tactic?
Matter of principle. It stains the mechanics of CQ. CS gets in, low morale... too bad, city lost. No one reasonable will spend tons of firepower to break a low morale siege. I certainly won't. The more people adopt LMD, the less siege breaks you will see. And for me, and many people... that's the fun part of CQ. So much for big wars between alliances, when all that really happens is LMD exchanges with no real fight behind it.
Again. Why adminstartion opens worlds with morale?
To promote the new morale mechanics recently introduced, for new players. Neglecting the fact it is exploited and abused by big alliances, instead.