That's a good question. I know very few people are taught cursive now, but I was forced to. I write mostly in cursive because it was required of us, and I had to stop so that other people could read my notes and stuff lol.

I was doing the graffiti thing in my late teens, and my opinions on it have changed as an adult.
We would often find walls in the woods that weren't visible so we could take our time, or we'd sneak into the CSX yards and paint on the freight cars.

Private/personal property was always off-limits, but commercial was murky. Public property was always considered fair game though. That guy writing that on the tunnel didn't even do anything creative with it. But i agree it doesn't serve the community at all, but as a kid I'd have said "it's public property" or something.

There was always theft involved too of the paint cans or markers.
But for the people that do those high-quality pieces they buy Montana or other brands designed for graffiti. I even have a huge marker designed for it I bought at a store in Baltimore that sold graffiti products.
Krylon & Rusto have thinned their paint probably to curb theft.

In Los Angeles and Baltimore there are actually sanctioned and protected locations.
I have an entire book of only LA graffiti.

Also I know guys who started doing it illegally, and eventually moved on to selling canvases in galleries.
I'll never forget being in a gallery in Baltimore, and looking at a painting and finding it reminded me of a local graffiti guy. The girl who ran the gallery overheard me mention him, and come to find out this painting was actually his. It wasn't even a graffiti, but a more traditional scene and somehow it reminded me of him.
Price was over a grand for 3.5 foot wide by 1.5 foot tall canvas.