We all know where they come from and what they do to them. Parents, pimps, or whatever you want to call it.
If the kid had any other choice, he would take it. It’s easy for you to judge sitting in your AC cars and appartments. Hidding behind supposed noble causes just so you can feel happy and sleep at night.
Prostitutes have been pimped for centuries, and this thing has been dealt with for centuries to no avail. You cannot change the way things are by dealing with the kids or micromanaging them. By not buying flowers, you are hurting them more because they will get beat up by whoever is running the show.
Buy flowers and let them save a couple or be happy ounce in a while if they get a little extra. They have enough on their plates already. And if you want to change stuff, then act where it is necessary, government actions and regulations.