They will kill, they will lie, they will mislead, they will bribe, they will embezzle themselves thus gaining power far faster, they will oppress and so on.
They will even start wars that solidify their power, distract their populace, get them more riches, etc.
Normal guy mcsmartiepants who says shit like, "As much as I would like to pay for everyone's healthcare and live in a world where things are cheaper because I make the choice for all of you, I'm afraid I'm not a perfect computing machine with zero requirements for energy or anything else of the sort, with perfect information on all goods and possible goods at all possible times, so it's not going to happen, and frankly I'll just be a far less manned, far less expert form of delivering that to you. My apologies," or at BEST, "We'll offer a limited safety-net only approach to welfare and schooling in which those who are incapable of accessing it otherwise will gain negative-welfare, that is to say they'll get income to make them reach a $ figure, so the more they earn, the less welfare they get, but without making it more rewarding to stop working. And perhaps a notable bump to tax-free," etc.
Normal guy mcsmartiepants who says, "Yeah, we'll legalise nuclear, sure, why not," is not going to win because there's like 30 billionaires with interests tied to that who will give ANY GUY WHO WON'T DO THAT tens of millions of dollars, either in future jobs, stocks, or outright.
In almost any other system, you can't force the person who inherits power to be malicious, you can't select it, it's extraordinarily more difficult to control for personality differences and more, and furthermore, they don't exacerbate greed. Why? Because greed can be moral. If you own shit, and you know that you own it, and that you're going to have to give it away to someone you care about, and it's very hard to just be like, "Exploit it, I don't wanna," are you going to mismanage 100 years of society for the hell of it?
When you inflate your currency, you actually literally make your own money worth less in that case. It literally belongs to you now. It's not an asset you can take more of a share in; the whole economy matters to your personal interest.
It's like running a business the size of a nation. You don't want to exploit all of your peasants over to the degree that they are significantly less profitable to you in ~20 years' time.
Least of all ~100, and you definitely don't want to hand your son a steaming pile of shit unless you're a complete toad.