So spending more of the tax payers money to keep the muppets inside is a better option than making them earn a way to pay it back?
And whoever the idiot that said graffiti isnt an art is a philistine, who are you to decide what or what's not art? In the wrong place, yes graffiti is inappropriate and makes the area look untidy but done well, it takes a decent amount of talent.
Prison isn't a cure for these types of offences and never will be, if you have talent and passion for something (which i guess the vast majority of posters on here dont), you want to express it as much as possible. What these yobs need is direction and the proper facilities to express them.