I used to carry fix a flat with one of my old cars because it didn't have a spare tire and I ended up giving away like 5 or 6 cans over the years to people at gas stations with flat tires.
For realio advice, you've got to let people like this just go. Too much bad shit in life already and problems of our own to sit there and get frustrated about how other people live their lives. There will always be a ton of idiots/scammers/evil people to concentrate on if you let it bother you too much. Something about inner peace or some shit like that.
I have made a hobby of collecting junk silver for years, have a couple of shoe boxes full by now. Not sure what I will ever do with it, probably just save it for use as currency after the zombie apocalypse.
I know a lot of the FD guys that have experience with both are very keen on both the FD and the different 911 variants. This is from a pretty experienced member who has had a few cars: