history has shown over and over and over again that big government is very bad.
Too much of anything is bad. Some water is good for you, too much and you drown. Some big company influence is good for us; but too much and we get corporate fascism and/or corporate communism (which may degenerate to regular communism).
The slippery-slope fallacy can be used to justify any position.
Overly-influential banks already had a big hand in crashing the world economy recently and almost got us into another Great Depression. (True, gov't mistakes contributed to it, but run-away greed was the main cause.) I thank Big Gov't for having prevented another Great Depression...in this case.