Please explain why you don't think it is "sustainable"?  Many wildlife populations are hunted sustainably and have been for many many decades....essentially proving that hunting can be biologically sustainable.  Even if the number is half of what the government says, the number killed through hunting (a little more than 200) is very unlikely to cause  the overall population to decline, regardless of the fact that these are a slowly reproducing ,"keystone" species, etc. Nor does removing 1.5% of a population constitute a "slaughter" as the term is now used in common parlance.  I suspect rather, that your main objection is a moral one and of course you would be entitled to express your own views on that.