Objection to Kenyatta statue on notes driven by malice, partisanship

There is a battery of lawyers out there on Social media. Whether they are quacks or the genuine items, both hold opinions that are at once brilliant and dumb. But then, law as a discipline is equally brilliant and dumb; so dumb that to confuse us poor mortals, most of it is written in a dead language - Latin.

Why would lawyers read from the same script and see different things? What is the need for a string of courts established in the order of superiority; each of which endeavours to prove the lower court incompetent in matters of interpreting the law, yet the ‘incompetent’ continue to draw salaries?