If I was a ghost I would try help them as much as I can, not prank them. Idk what influence I'd have, maybe I can appear in influential people's dreams and influence them to do better.
Ironic that you're complaining about people complaining. For an answer to your question, people complain because they have things to complain about, particularly as the world moves more right wing, and just because others have it much worse doesn't mean you don't have it bad.
In the UK, it's not great, and seems to be on the down trend like everywhere else, but right now it's a decent enough place to live - definitely a lot better than the US.
Based on what they try to do. Negligence can be bad of course, but making honest mistakes is no ones fault. If they're doing harmful things though, even if they can still be considered a good person, it can be a moral obligation to stop them.
Titanic for sure, there is almost nothing wrong with it. Most movies are pretty bad in my experience, with the runtime of TV shows allowing them to be better. Back To The Future is okay though. Maybe one of the Futurama movies? That's kind of cheating though, as it built on a TV Show
Not incredibly weird but mist people are surprised when I eat multiple breakfast cereals together, like a salad, rather than just one. I like Wheatabix with shredded wheats, raisin wheats and fruit and fibre often. I do usually have it with almond milk though, rather than plain, so not too weird.
If I was a ghost I would try help them as much as I can, not prank them. Idk what influence I'd have, maybe I can appear in influential people's dreams and influence them to do better.