But if the job of the institution is to deal with the practitioner's actions without succumbing to pressure, then it is appropriate to blame the institution as well as the practitioner. But the problem is, one of them has complete authority over the other if they choose to. It's kindof like blaming drug dealers for getting too powerful when they start buying off the cops for protection. The problem isn't entirely the drug dealers, although there are ways of dealing with them, the problem is the dirty cops. You don't make the dirty cops more powerful, as they're likely to just start doing a better job of protecting the drug dealers.
Also, we all know that people are fallible. You will never not make a government 'powerful' enough that people won't just do what is in their best interest. The point of limiting federal authority and maximizing state authority is that there are more points of failure - odds are, eventually, someone with a backbone and a genuine interest in protecting the people of their state will get elected, and then 'they' won't get what 'they' want everywhere. Also, I bet state senators would be offended you think if you only offered them 1/50th of what you would pay a federal senator to buy them off. :-)