Liberals have a rendezvous with regret. Their largest achievement is today's redistributionist government. But such government is inherently regressive: It tends to distribute power and money to the strong, including itself.
Government becomes big by having big ambitions for supplanting markets as society's primary allocator of wealth and opportunity. Therefore, it becomes a magnet for factions muscular enough, in money or numbers or both, to bend government to their advantage.
The left's centuries-old mission is to increase social harmony by decreasing antagonisms arising from disparities of wealth — to decrease inequality by increasing government's redistributive activities.