It’s not so much a plan to reduce population as it is to redistribute population, from crowded underdeveloped nations to the US and Europe and from rural to urban in the US. In the western part of the US, they often talk of returning the land to its rightful owners, the Indians.
They want us all to live in high rise apartments and get rid of our cars and our freedom to travel.
It appears that you have not read up much on such topics.
Perhaps reading even 20% of the following quotes would be a good start.
http://www.freerepublic.com/focus/religion/2130557/posts?page=81#81
I agree that what you describe is definitely part of the picture. However from some of the things I’ve read recently, I’m inclined to wonder if the redistribution is only an initial phase (as Cass Sunstein would say, “nudging”) to herd people and keep them calm until all are completely under control.
If one looks at history, whenever you get a tyrant or oligarchy into place, most of the time you will get governments who are not afraid nor timid about killing whoever and in however many numbers they please.