Essentially making posts and comments with an intent malicious in relation to the goals of the community with a clear intent of mocking or bullying, as well as coordinating such actions at scale.

Raiding is very bad because it doesn't actually serve to rectify the wrongs of the community or provoke deep thinking, but increases intolerance and hostility.

If you want Uplifting News to be actually uplifting, make your voice heard in the comment section on how short-sighted such approach is, and if somebody asks, direct them to the orphan crushing machine phenomenon. Also, post actually uplifting news - ones that would be seen as positive by absolute majority of the audience.