OCDO member User, a practicing criminal defense attorney, puts on a legal seminar in which he explains that the trade-off of spending a day or so in jail (despite everything bad about that) is well worth it in comparison to spending the next 20 years to life in prison.
History bears out that even the most rightous shooter is likely to say at least one thing that both can and will be turned to become the one thing that sealed their conviction.
Unless you can practice saying "My name is <> and I live at <>. That person (the one with holes in them and possibly already dead) attacked me with that <weapon>. I believed s/he was going to kill me if I did nothing to stop them. Those people saw what happened. I feel sick and want to be seen by a doctor. I am willing to talk with you but will wait until my attorney gets here to do so." - and nothing else, all while your heart is beating fast enough to qualify as V-tach (a deadly condition) and your mind is desparately trying to process and make sense out of what just happened, let alone what is going to happen, all to the point of being 100% sure you can stick to the script and not ad lib, and do it consistently and on demand, then you are most likely safer off ****-ing except to say you want to talk with your attorney, not some conveniently handy court-appointed one.
Since shooting someone is going to cost a lot of dollars, I'd rather spend them with the best chance of not winding up going to prison because of some "little" thing I might have said that can be interpreted at least two ways and will be interpreted the way that is most detrimental to me freedom. A night or three in jail sucks, but 20 years to life in prison sucks even more.
But as any good attorney (yes, there are some out there) will tell you, all they can do is tell you what the law says, what the courts have decided that means, and point out any possible penalties you might be facing. They can suggest a few ways to try and present your case such that you might not end up locked up, or at least only be locked up for the least possible time. After all that it is your responsibility to decide what to do - **** or try to say only things that can not/will not be used against you in a court of law.