What are they getting out of sacrificing children? To answer that question we must, in my opinion, look to ancient Scripture. The Old Testament tells us that when Israel deviated from God, they did not simply start jaywalking, smoking cigarettes etc. They had their "high places". Historians tell us this is where the Israelites who rebelled against God sacrificed their own children in the fire.
Why? Remember Moses, when he went up to the mountain and received the Ten Commandments. When he returned, many--not all--of the Israelites were worshipping a golden calf. The golden calf is a (false) deity they picked up from the Egyptians. As a depiction of Satan, he demanded child sacrifice and sexual rituals in exchange for wealth and riches. That cult is very much alive today, and it is global.
This practice did not originate with Israel, as they got it from the Egyptians. However, Satan is extremely pleased when he can corrupt one of God's chosen people, from a George Soros to many other prominent names. To the present day, Satan worship is deeply interwoven in human history. Worship him and you will receive the wealth of the earth etc. However, Satan is very demanding, and requires constant sacrifices, as evidenced for instance by the Aztecs who could not conquer enough tribels to find victims to sacrifice.
There is no such thing as a free lunch. Satan demands that his followers thoroughly debase God in EVERY way possible. A true Satan worshipper will be infested with so many demons that he/she cannot stand being in the sight of a holy person or place. They loathe Jesus. That is why Q reminds us repeatedly why the CABAL wants to remove the Bible. It is not a symbol, as many today believe. The Bible is the WORD of God. It is living. Our battle is spiritual and we have lost so much ground since WWII in the West especially because the church has surrendered, either through lukewarmness, apathy or infiltration. There are only two sides. Most people do not acknowledge or believe that.