Firstly, I could not possibly care less about the opinions of most redditors. Secondly, it isn't your place to decide what is or isn't appropriate. This isn't the first time something like this has been requested, in fact it's even been requested on the Japanese forums(it's the only other forum I can read or participate in). It's cool that you don't like it. But if seeing someone's personal memorial to someone they cared about causes you that much distress, I advise you to seek help. Real life does bleed over into the game; real people play these characters and real people go through real life situations. Families have ways to commemorate the deceased, and even their real life friends too. But you make friends in game, sometimes friends for life. Someone expressing their grief has nothing to do with you, and you treating like it does is self centered and arrogant. So again, if merely seeing a memorial like the one requested(which could be used for rp purposes and have nothing to do with real life), you have the problem, not the rest of us.
edit: also, with 6 million copies sold, what makes you the authority on this topic? You don't act like this when people are grieving publicly offline, so is it just online that bothers you? Because telling someone that their grieving is inconveniencing you by being a "downer" is a dick move and you cross a massive line when you do it. You don't have the right to tell people that how they grieve is inappropriate just because you don't want to see it. Personally, if they weren't my friends I'm callous enough to say I don't care. But I support the right to grieve someone you loved in a way that is healthy for you on an individual level. And AGAIN, the fact that RPers have been requesting this item for a long while now means that many people who /do/ want this item won't be using it for real people. How does any of that have a single thing to do with you? If it causes you distress to see it, don't look at it. Don't read it. If memorials IRL don't bother you, then ones in a video game shouldn't either. It's the same damn thing except one is bad on the environment(hint: it's the one in real life because it takes up space that could be used for other things).