Just HOW can you support communism as a Polish person after everything it did to your country?????

See, for example:

The rapid increase in the living standards of the workers and peasants in post-World War II Poland is reflected in the trends in meat consumption. In 1966–68 Poles were consuming an average of 47, and in 1975–77, 61, grams of animal protein per day. This is higher than the Western European average, and almost equal to that of the United States. For example, in 1975–77 West Germans ate an average of 55 grams per day; Italians, 45; and Swedes, 62. In the United States animal protein consumption per capita was 73 grams a day, and in the USSR, 51 grams (FAO, 1978:table 9).

The rise in living standards has also been reflected in a radical increase in social services available to the Polish working class. In 1977 there was one physician per 610 people in Poland, compared with one per 1,070 in 1960 and one per 2,660 in 1938—the average for all the advanced capitalist countries in 1979 was one per 620 people. The attention given by the socialist state to health care was reflected in the radical reduction in infant mortality from 140 per 1,000 live births in 1935 and 111 in 1950 to 22 per 1,000 in 1978 (the U.S. rate in the mid-1960s) (see U.N. Statistical Yearbook, various; World Bank, 1981: tables 20, 21).

[…]

The 1970–75 period was extremely successful economically. In these years national income grew by 9.4 percent a year (the rate was 6.0 percent from 1965 to 1970), industrial production by 10.8 percent (it was 7.8 percent from 1965 to 1970), and net fixed capital formation by 18.4 percent (it was 9.2 percent from 1965 to 1970), while wages grew by about 12 percent a year (compared with about 2 percent a year from 1965 to 1970). Food prices remained frozen over the 1970–75 period. Between 1971 and 1974 productivity grew at 7 percent a year (Hare and Wanless, 1981:505; also Table 3.1 in this chapter).

(Source.)