The fact that they are so drawn to bleeding in particular as a method of getting attention has much to do with their cunts tbhnglfam. The cunt is literally a bleeding slit itself, and it is no coincidence that roasties seek to recreate this form much like males seek to recreate the phallus and draw it on everything. Whereas a phallus symbolizes order, the cunt or the cut mark symbolizes chaos, as Jewden Peterstein might say.
Although it must be said that cutting as method of getting attention is also observed in males, like those who were in cult of Baal and cut themselves in order to bring about His presence, or certain Shia Muslims in the modern day who commemorate the martyrdom of Hussein.
Perhaps roasties view Chad as the equivalent of a god or a great figure, and cut themselves for similar reasons -- because they want his presence, or bemoan his loss.