Things rarely go "swimmingly" for the left because it fights against existing power structures, and those power structures fight back. And the countries that tend to have socialist revolutions also tend to start out with terrible conditions, bad enough for people to rise up, and then made worse by the devastation of conflict. Then they have to grapple with future threats from invasions, sanctions, and clandestine subversion.
In spite of this, many socialist countries have made major improvements to people's lives, especially in comparison to what the previous regime had been doing.
For example, Cuba was a gangster state under the dictator Batista, who was in league with the American Mafia and plundered the country for his own profits and those of wealthy plantation owners. After the revolution, in spite of sanctions, life expectancy improved greatly surpassed the US, literacy skyrocketed, and the country now has the highest number of doctors per capita in the world, who are regularly sent abroad to provide aid. Cuba recently (2022) passed an amendment to its constitution which greatly strengthened LGBT rights and gender equality.
Trump is just as much of a warmongerer as anyone. He nearly started WWIII with Iran by assassinating Soleimani. Dick Cheney just doesn't like him because of personal reasons.
The only isolationists/doves are third party candidates, as has been the case for well over 20 years.