Yes, I do believe that the claim that accused police killer Scott Michael Greene is said to have mental health issues is going to make the judgment on him more lenient. It seems that if a defendant can prove that they have mental health issues, they often get a much more lenient sentence.
I think that Scott Michael Greene's alleged mental health issues will definitely impact his judgement in his murder trial. Mental health issues have been gaining more and more attention in recent years and being treated as a very serious, sensitive issue. In many criminal cases, mental health issues have swayed the verdict one way or another. This could definitely be the case in this situation.
Scott Micheal Greene is a conservative, straight white male. This alone is going to help influence the judge towards being more lenient towards him. If he has mental health problems this might make the judge more linient on him, depending on what kind of mental health problems he might have.
I don't think there is any way to paint this crime to be less serious than it is. The lawyers would have to have a very good and compelling case to make this mans sentence any less severe. You can't kill police-men and expect to get away it without a severe punishment.