after all the maker of the item is responsible for what people do with their products.
you are wrong you just don't realize how faulty your logic is.
it doesn't why cars were invented companies are responsible for what people do with their products remember that is your logic or at least core belief of the logic you are using.
guns were invented for personal protection that was the core reason they were invented and many early guns couldn't shoot more than a few feet with any accuracy.
again we are talking about your core logical belief here.
Had there not been a D-day, or Lend Lease, however, the USSR would have been at great risk of stalemating with the Germans on the Eastern Front. A key factor would have been German policies towards the peoples of occupied Belarus, Ukraine and Russia and how willing the locals would have been to either fight the Soviets, or at least not actively oppose the German occupation.