These are reasons to avoid meat not an explanation of why hamburgers in particular are worse which was the original question. Your studies are mildly interesti

These are reasons to avoid meat not an explanation of why hamburgers in particular are worse which was the original question. Your studies are mildly interesting but correlations are low and large scale studies of vegetarians do not show any benefit in terms of longevity. The reasonble take away is that, while meat consumption may certainly increase the risk of some things, it also prevents other things.