This is a scientific article available at https://www.ncbi.nlm.nih.gov, Published online 2019 Apr 24, and look now at the text it contains:
Comparisons have stated that mRNA offers an advantage because RNA itself cannot integrate into genomic DNA without the presence of the viral elements in a retrovirus that enable such integration (reverse transcriptase and integrase). However, HERVs  (human endogenous retroviruses) whose remnants are now permanent parts of human genomes as retrovirus-like sequences comprise up to 8% of the human genome. In addition, some recipients of mRNA drugs or vaccines may be already infected with a retrovirus (e.g., HIV), thus providing a theoretical means for provision of the proteins needed for integration [69,70].
And they keep calling us conspiracy theorists?
Here is some source materials:mRNA-as-Vaccine-07-00037