As I noted in some detail in 2009, persons who kill themselves in accord with civil law perform a number of public, verifiable steps that—if the laws are being applied as they are written—all but eliminate any ‘pious presumption’ of diminished culpability for one’s self-murder. The ‘benefits of the doubt’ that we want to accord to ‘traditional suicides’ can hardly be offered to those who kill themselves under civilly-approved circumstances. To accord to such persons ecclesiastical funeral rites indistinguishable from the liturgies the Church grants to the faithful who die natural (sometimes even heroic!) deaths cannot but give scandal to the faithful. Indeed, to use the sacred rites of the Church for such ends is, I suggest, to commit a grave liturgical abuse, one savoring of sacrilege (CCC 2120).
Finally, ‘assisted suicide’ is, along with ‘legal abortion’ and ‘compassionate infanticide’, one of the three heads of that cerberus known as the Culture of Death. Precisely insofar as the modern death cult is cultural, it permeates everything and can appear anywhere. It must be quickly recognized for what it is and confronted wherever it manifests itself. If that means, in part, invoking the salutary admonitions of canonical discipline against manifest sinners and protecting the faithful community from the danger of scandal, so be it.
That’s what the law is there for.