Last month I dumped around 20 gallons of infected beer from 4 kegs. Most were several years old. I just couldn't brin myself to dump them....I tasted each one before making the decision. Now I have lots of clean empty kegs.
A fifth keg, a sour baltic porter from 2006...actually tasted quite good. So I am calling it "18th century London porter" now, and it is a classic.
Regarding giving it to bums....many years ago, I bought a couple of flats of Concord grapes from the farmers market, and made a pyment with them. The resulting beverage tasted like Welch's grape juice spiked with Everclear. Yuck.
I took a case of it down to a local park that is near the homeless shelter, where bums are often found. I left a note in the box that read: "Homemade wine. I don't like it, but thought someone with a thirst might." When I drove by the park later that day, the case was gone.