For covid it makes sense due to the haste (whether you agree with said haste or not, you know it makes sense given said haste exists). I can't speak to other,

For covid it makes sense due to the haste (whether you agree with said haste or not, you know it makes sense given said haste exists). I can't speak to other, more deliberate, vaccines, but I suspect it exists there as simply protection the companies negotiated for.