BlackRock is a provider of financial instruments (such as popular iShares ETFs) http://quicktake.morningstar.com/fundfamily/blackrock/0C0000... and is unlikely to call the shots at Deutsche beyond adhering to its voting guidelines during annual corporate elections.
As I understand it BlackRock signed up to the Stewardship Code - designed to ensure that asset managers take a role in the companies in which they hold significant interests.
Ignoring/avoiding their responsibilities is not ok
No ETF or fund holder votes their proxy. So it falls to the Blackrocks, Vanguards and Fidelitys of the world to hold self-serving corporate boards to account.
