The original question in this thread was about why PCT hikers find it necessary, or preferable, to hitchhike at times. There is an implication that this is somehow "cheating" and that the hikers are supposed to stay on the trail. It might be interesting for Joe to read at least one account of someone's journey on the trial: one of the older publications, or the recent Wild by Cheryl Strayed, which is also a movie. Bill Bryson's classic A Walk in the Woods is also good, but about the Appalachian Trail and is more of a humorous account.
First of all, hikers need to go off the trail, i.e. coming into WW, to get supplies they've shipped on ahead, and other necessities. Second, there are numerous hazards that end up closing portions of the trail. Both of the major fires in our area last year, while they were active and afterward, closed portions of the trail in the SB Mts, the San Gabriels and the desert. There are some years, where the snowfall has been so great, that the trail is simply impassable in some places. Or the risk of avalanche is too great. Some portion/s of the trail in the San Gabriels have been closed for quite some time. The re-route is also dangerous because it requires hiking on the road for quite a distance. Third, there are unexpected weather conditions. Most of the hikers in WW at the end of this week were trying to restock and then get out of town on the trail quickly to not get caught in the snow, sleet, hail, rain, we are having this weekend. Fourth, a hiker may need to rest, or obtain medical care. These are only a few of the reasons why hikers come off the trial, and it is perfectly OK to seek a ride. It is also appropriate to do a portion of the trail, leave it...perhaps because the next 100 miles are impassible...and return to it at a different time, maybe the next year. Just envision how dangerous it is for someone to be hiking along Hwy 2, or 138, or any of these highways. Much more dangerous on the highway than on the trail at times. Of course, the best education about hiking the trail is to do it...or do portions at a time. It's an amazing feat even to hike portions of it. Experiences we can all learn from.