Insurance companies have formulas they use to determine fault.
Typically all involved parties are determined to be at fault. Percentages of fault are assessed.
You may be assessed for being anywhere between 1 and 20 percent at fault, simply for being on the road, at that day, at that time.
The key is to ensure that your company subrogates on yours (and their) behalves to recoup your deductible, as well as making your company whole for all monies paid.
Sorry to see this happen. An entire new door, or maybe even just a new door skin, and that lower rocket piece will fix you right up.