Perhaps you should check the links provided. There have been multiple times in history where viruses jump their host. Define human intervention, because if you are suggesting that this is a man made virus you haven't looked at the genomic code of this virus.

They sequenced the genomes of 15 viral strains from the bats and found that, taken together, the strains contain all the genetic pieces that make up the human version. Although no single bat had the exact strain of SARS coronavirus that is found in humans, the analysis showed that the strains mix often. The human strain could have emerged from such mixing, says Kwok-Yung Yuen, a virologist at the University of Hong Kong who co-discovered the SARS virus: “The authors should be congratulated for confirming what has been suspected. (Evolutionary Relationships between Bat Coronaviruses and Their Hosts ) https://wwwnc.cdc.gov/eid/article/13/10/07-0448_article#r1