The point is to not allow a company to be able to buy out the entire country. Maybe Novo Nordisk is a good steward but historically companies like Google and Amazon act only their own best interests. Breaking up these massive companies ends up doing the better thing anyway - a surge of competition emerges and offers better and often cheaper services. Look at the break up of Bell. The short term was marginally negative (higher long distance costs) but the market was better for it.

Google has a substantial amount of control over the flow of information in the United States. To the point it can literally redefine truth. This is a problem - and one that is easily solved by breaking up a de-facto monopoly. Moreover, the acquire-and-kill strategy stifles innovation. Imagine what we would have if Google didnt have the capital to buy and kill so many small companies.