Personally I don't think that LDL as such causes any "damage".Is the idea here that the trigs facilitate the process by which LDL can damage arterial walls, so better for the trigs to be low? Or are elevated trigs harmful directly independently of LDL?
Lower trigs are usually associated with lower inflammation levels possibly due to reduction in carbohydrate (sugar) levels in the body.
Nothing is proven in the relationhip between heart disease and cholesterol and there are multiple theories as to actual causes.
The theories that I think are the most logical disagree with most mainstream thinking (which as usual leads to profits for companies that make LDL lowering drugs).