And also to convince the public opinion. Saying that psychedelics may help some depressed patients will instantly prompt the defense "but we already have tons

And also to convince the public opinion. Saying that psychedelics may help some depressed patients will instantly prompt the defense "but we already have tons of antidepressants to give them, with a diverse range of mechanisms of action; psychedelics cause schizophrenia bla bla". By pushing the focus towards cancer, which is a more sensitive topic, people is more prone to make some concessions. That applies to legislators too.