Well theere are several errors in what you're basing your conclusions on thereby increasing the chance that your conclusion will also be in error. First off iwith the Trump situation, the case of his inflating values is only one of the four different matters he's indicted on so to say that's why "they" are upset is incorrect. Also it's not just about him falsely inflating values to secure a loan, that was just part of it, when it came time to pay taxes on those same properties he would find ways to falsely devalue the same properties to either pay less taxes or pay no taxes at all. Now on the surface these might seem like harmless crimes but the aren't. Lending institutions only have a limited amount of money to loan and so when one person fraudulently misrepresents the value of his property to get a bigger loan then he would normally qualify for honestly that means that somewhre along the way someone who may be borrowing in good faith will be unable to get a loan because someone else got more then they were entitled to. With taxes the victims are everyone else who benefits from those taxes, less tax revenues means less money to pay for things that government does for or offers it citizens and so maybe the population as a whole loses out on things they would have benefitted from if the government raised more tax revenue. If the short fall in tax revenue is bad enough then another result is the government charges everyone else higher taxes in order to pay for the things it wants to do or the serviices it wants to offer.
Now as far as the government raising values to increase tax revenue, that's nothing even remotely like what Trump did. I'm not sure how it is in all States or Counties but in the one's Ive lived in the value that is appraised to property for taxes is always significant;y less then the actual value, usually it's about half the real value. So if they do increase the value to raise more taxes it's still going to be a good bit less then if they based it on the true value. In Trump's case when he inflated the value of his properties it was solely for his benefit. When the government raises values to increase tax revenue it's generally speaking for the benefit of everyone under the jurisdiction of that government.
As far as Trump paying off his loans he only did that because he had to if he ever wanted to get a loan in the future Trump has a fairly long history of getting out of financial obligations by declaring bankruptcy. Fortunately for the banks loans aren't one of the debts you can escape by bankruptcy. Trump also has a well established history of not paying people for the goods or services he went to them for, often to the harm of the people he didn't pay, just ask Rudy Giuliani or any of a number of construction companies who had to go out of business when Trump defaulted on what he owed them.
As far as taxing individuals vs corporations while it is true that corporations generally pay higher taxes then individuals because they pay more money the comparisson you're trying to make is false because corporations generally pay at much lower rates then individuals and they have more ways to shield their income then individuals do. For example a company can do all the same business and make the same profits and yet avoid the taxes simply by moving their headquarters to a more tax friendly country. That was the whole basis for Trump reducing the tax rates and giving such a huge tax cut to the wealthy, to give them a reason to move back to the US. Except they still kept their manufacturing where the labor was cheapest so it didn't bring in all the jobs Trump made it sound like his tax cuts would bring.
As far as who is worse, Democrats or Republicans? That's a flawed question because there are good and bad individuals in both parties. That sort of thinking capitalizes off the fact that most people want to vote in a particular party and just not be bothered with thinking about it much until the next election. That's also why politicians make grand promises based on a party platform and yet somehow those promises rarely materialize. Unfortunately until people start paying more attention and holding politicians accountable regardless of their party, these sorts of problems contnue.
All of these issues exist because people tend to only look at things in a superficial way. As the old saying goes, "the devil is in the details" and this is true whether you're talking about the law, the courts, taxes, governments or politicians.