These people feel that they are in the losing side of a win/lose situation.
So they are going for a lose/lose situation out of spiteness.
The solution is to always go for the win/win situation, even if it leads to smaller wins. It avoid building up resentment, that will always lead to a lose/lose situation.
There isn't a single socialist country in Europe since around 1990 (and good riddance). I think the term you're looking for is social-democracies (for the political system) or social-market-economy (for the economic system).
"Socialist" is such a loaded term it's kind of best to avoid it in any discussion where you aim for clarity.
The original definition, which is where it got its lasting popularity, comes from the popular workers' movements of the 1910s and 20s: workers owning the means of production. That is basically describing an economic system in which enterprises, particularly factories, are democratically controlled by the people working in them, who would have a say in how the enterprise is run.
This notion of socialism was corrupted by Lenin and his ilk when they essentially seized the worker's revolution that tore down the Tsars of Russia and founded the USSR. However, instead of decentralized workers' councils actually owning, profiting from, and controlling the factories (and farms and other enterprises) that they worked for, the state was put in charge of all of these. Ostensibly the state represented the will of the people, so that is how this leap was justified, but of course in reality it was one of the most heinous dictatorships that the world had seen in a long time. But because worker's rights were a popular idea at thrle time, the new absolutist monarchs of the "Soviet" empire kept claiming they are "socialists", just as they claimed they are "democratic", and no one bothered to contradict them.
In the meantime, in the West of Europe, particularly Germany, the same basic workers' movements were co-opted by Hitler, here claiming that he represents the people of Germany in their interests against the bogey-men they hated, the Jewish people (and Armenians and a few others), identified as evil Capitalists that had to be combatted. So they also named their movement "socialist", while in reality having an iron grip and military-like complete top-down control of the means of production.
Finally, more actually democratic forces that were nevertheless interested in keeping the capitalist status quo came up with a series of more minor reforms that would give some more resources, better lives, and rights to workers without actually putting them in full control of the enterprise they worked for. This movement ended up calling itself social-democrat or democratic socialism. Being very much similar to the previous status quo, and keeping the wealthy in power and in control of enterprises, while also not egregiusly oppressing workers to the point of revolt, this proved to be the most enduring form of "socialism" that persisted.
Ofcourse in Europe we learned that socialism improves the lives of the proletariat not national socialism.