Dang, I can understand getting annoyed, but he should have realized, a desirable car like that... People will be interested, perhaps let it live on, especially with back story, and perhaps work out an arrangement where he could have seen it fully restored or what not. That's what I would do I suppose...
Though, when I was 15, I did landscaping with a buddy of mine. One of our customers, they had a 95 Contour GL, and a 2000's Honda Civic DX. It was clear the Honda got driven more, and the Contour just sat. When the clippings from the lawnmower got on the Contour, they stayed there.
I asked them one day how come they didn't drive their Ford, and the answer was it had a blown engine, and they wanted to get rid of it, but didn't know how to sell a broken car. The car overall looked great, and I figured I could have fixed the engine, the husband jumpstarted the car, ran like a dream. I couldn't believe it was blown. Well, it overheated, and a mechanic said it had a blown engine and needed a new engine. He was willing to let me have it for $300, and felt bad about charging me that much.
Come to find out, it was a faulty sensor that fed the Instrument cluster, it never had any issues
I would have never gotten that car if I kept quiet. I've been hoping I could strike gold twice... But haven't gotten lucky again. I ended up selling that car for $2000, which I regret to this day.