It's not that no one cares or there's too much to go around--it's more that there needs to be better organization and networking to get these fruits and vegetables to those that will use them and those in need. Just because you have a thriving lemon tree doesn't mean you need or even want 30 lemons each week. So what's one to do?
Depending on which state and community you live in, there are great foraging and food sharing resources online. In my community of Oakland, CA there is a new program called Foodpool. Foodpool's mission is to "create small, local groups to gather backyard garden produce and deliver it to food banks and food pantries." They noticed a trend that more and more people are growing their own food while more and more people are also going hungry. So they developed this network and way for people to form groups in their own cities to gather and deliver food to those in need.
Search for a Foodpool in your area, and if you notice there isn't one, you can start one and they'll help with resources and marketing. Foodpool is in the beginning stages, but holds a lot of potential. During this early fall harvest and as we start thinking about sharing the bounty of the season, it couldn't be more timely.