Earlier quoted context omitted.
In my opinion, if you agree to a deal and then decide not to fulfill your end of the deal, that is immoral. Like if you agree to pay me to make you a sandwich and then you take the sandwich but leave without paying, that is immoral.
“To steal from a brother or sister is evil. To not steal from the institutions that are the pillars of the Pig Empire is equally immoral.” ― Abbie Hoffman
For example you should never ever vote on politicians that waste tax money. Some countries do that, but USA is not one of them since Americans thinks its moral to steal from the government so they don't blink an eye over every president using millions on his own or his wifes personal projects. "I'd also do that if I was the president" is how that gets perpetuated, you have to stop voting for any such candidate and only vote for those that promises to put an end to it. That would mean voting third party, but...