Some street art is really good, no doubt; but only some of it. The vast majority of urban daubings is the meaningless scrawling and repetition of tags. It’s dispiriting to see every available public space sprayed with someone’s name. Advertisements, even if we don’t like them, can be taken down and are updated often; paintings you buy can be sold when you’re tired of them or just taken off the walls and stored for a while. With tagging, there’s no choice for anyone but the tagger and this is the problem.
The simple tagging phenomenon (distinct from genuine street art) is just a sign of a kind of childish emotional incontinence -they don’t want to have to go through the process of putting their art through any kind of review because they don’t really believe in themselves.
Life is all about growing up and working hard at what you do and presenting your work to the general public who may very well be indifferent to it. That can be tough, but if indeed they are, then you need to go away and work harder on your craft or you stop altogether and find out what you’re actually good at.
It’s simply not true that taggers have no other means of putting their work forward. Didn’t Markey Robinson make his work surfaces out of discarded materials? Art materials have never been so available and cheap.