a truism is an assertion of truth within a context. So, that is to say, within the context of science a sun is a flaming ball of gas, whereas in the context of poetry it might be the symbol of eternal love. Within those contexts, particular statements resonate as correct, those are truisms.
they wouldn't be more useless. see, morals aren't there to trick us into acting right. it isn't that they work because they make grandiose claims as to the nature of the universe and of right and wrong. This is why they fail. This is why people are farting around this forum unable to explain where their rights come from, because morals confuse you into thinking their integral, some necessary part of the equation. Instead, teaching the status quo could be done through story telling, via quotes and parables. This is how humans naturally express themselves and educate one another anyways. the appeal to good and bad is an excessive and useless process designed strictly by the western world to create something called moral high ground. its just to make other people look savage.