Which is basically inhuman. For an administration of any sort, you need a selection process and the selection process will then be gamed by exactly the people who seek power.
Which is why we have large bodies of political representatives: people will not stop seeking to acquire power and act in their interests and the interests of their backers, but they will be counteracted by people doing exactly the same but pursuing different ends. That’s a very human thing.
Based on what I have seen, most politicians genuinely believe they are working for the common good. Their understanding of what the common good is obviously varies.
In a system like that, politics is mostly about playing the long game. You build a personal brand that gets you elected and re-elected and gives you influence within your party. You build and maintain your networks, you collect political capital by supporting others' goals, and you spend the capital to advance your own goals. You try to find a balance between short-term and long-term goals, because your opponents today may be your allies tomorrow, and you don't want to alienate them by playing too hard.
Unpleasant and toxic people may sometimes survive in politics. They are rarely successful, because politics is all about people skills, at least in the system I know of. (Such people are more common in administrative positions, because their status is more secure in a meritocratic hierarchy.) People focused on specific topics often also have a hard time in politics, because they have a tendency of becoming unpleasant when things don't go their way in the niche they are interested in.
The public image of politics can be toxic, because the current publicity game requires it. The same politicians often appear quite different behind closed doors, where they are allowed to speak off the record.
Politics is manifestly not about the public good - not even with compromises.
It's mostly about a few unpleasant - sometimes charismatic - individuals pursuing power for their own personal benefit, and covertly that of their funders and sponsors.
Science has nothing to contribute to this, because the entire business is so hopelessly toxic and corrupt that rational debate about policy doesn't even get to first base.
If you want rational policy you don't want politics. It's perfectly possible you don't even want democracy.
What you want is administration - a very different process where mature competent executives and managers who do not have Dark Triad personality traits make intelligent, informed, and compassionate decisions in the public interest based on evidence, expert guidance, and their own good instincts. And their power is strictly limited to the lightest possible enforcement required to do the job.
No country has even been run like this, but a few have managed to operate like this in selected subfields.