Which is why most used automotive parts suppliers call themselves Automotive Salvage yards.
I am sure everyone here understands but to review, the idea is to Salvage the good, usable parts from the vehicles prior to them being crushed.
I would say its a bad practice to use wear items from salvage vehicles but items that can be measured and inspected to tolerances from the factory manual are encouraged to be reused. I install used engines, transmissions, rear differentials, interior and exterior trim pieces and electronic items all the time. Most of these can be purchased for 20 percent of the cost of a new one from the dealer and even better are available much quicker than waiting for a part from a dealer that has to order the part in.
If a part is in stock at the dealer its probably one to install a new one of. If not, its probably good to buy it at the "junkyard".
Also:
Keep it clean. Don't call each other names and bash each others ideas. Challenge ideas and suggest but don't smash on one another. This is a friendly place to talk Subaru. Infraction points have been given and will continue to be given if it doesn't stop.