The important point here is that you give Vanguard money, which they use to buy shares for a fund, and Vanguard votes the shares having outsize influence in the selection of the CEO, and possibly other C level employees. This is control of those whom have operational control of the company. If they could be shown to vote in a way which reduced the value of an investment, then one could possibly sue for breach of fiduciary duty. Get woke go broke may be damages caused by a fiduciary manager in some cases.