this artsi is talking about power. saying that being powerful can turn someone and make them step on other people thinking that they are above and not equal. as you can see he is blocking the water by squeezing the pipe and not letting the kid have any.
This graffiti by banksy explores the idea of our dreams being dictated by society's expectations. In order for us to continue to live amongst the norm, we are at constant war with society's view on life. This image is a metaphor for how much control we actually have over our decisions