Historically, you're completely wrong.

1. Hitler came to power with the support of capitalists (here meaning "people who own substantial capital" rather than "ideological supporters of capitalism"). They saw him as a way to maintain order against socialism and to break the power of unions. A similar story happened in Italy, and in other fascist countries.

2. Many capitalists did in fact benefit from fascism. There's some confusion about fascist economic policies, but you should know that the term "privatization" was first coined to describe the economic policy of Nazi Germany. When they nationalized companies, it was because they were minority owned, and often they were redistributed upwards to the capitalists.

3. Labor rights suffered tremendously under fascism, with labor organizations exterminated, allowing capitalists to impose much worse conditions, lower pay, and longer hours on the workers, as well as using prisoners for slave labor. Any attempt to challenge these conditions would be considered treasonous, undermining the war effort.

4. Even when their countries were defeated militarily, many capitalists got off scot-free. For example, the pharmaceutical company Bayer (which merged with Monsanto in 2016) was once a part of IG Farben, which manufactured Zyklon B for the gas chambers. After the war, Bayer rehired Nazis to high level positions, including for example Fritz ter Meer, who had been on IG Farben's board of directors and became chairman of Bayer, despite being a convicted Nazi war criminal.