Why did schindler hire Jewish worker instead of Polish workers both were available?

Answer 1

Originally, Schindler sought to profit from the German invasion of Poland in 1939, buying a factory in Krakow at a low price and employing Jews as cheap "slave" labour, which he was able to do under Nazi rule. Schindler initially hid wealthy Jewish investors, possibly for profit, but later he began shielding his workers without regard to cost.

Schindler began actively helping the Jews after witnessing a 1942 raid on the Kraków Ghetto, where soldiers shipped the ghetto inhabitants to the concentration camp at Plaszow. Appalled by the murder of many Jews who had tried to hide, he worked to transfer them to a safer place. He was skilled in persuasive speech and often bribed government officials to avoid being investigated.

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Answer 2

some of them had given him all of their money in exchange. As for the rest, it was because they were cheaper.