Quite the claims you've made: "Freedom" is difficult to quantify, but I would argue that as an individual we do typically have a decent standard of liberties. As long as you're white, male and haven't ever committed any sort of crime.

"One of the safest", according to multiple safety ranking organizations, the US is on the higher half of crime rate (per capita) and typically ranks in the bottom half (89) in safety ratings. https://www.numbeo.com/crime/rankings_by_country.jsp

"Gives the most opportunity" I think this depends largely on what you consider opportunity. If we look at poverty rates, the US is also not near the top with about an 18% poverty rate. I would consider anything more than 0% to be a place that does not provide the most opportunity. Sure, not everyone is willing to do what they need to get out of poverty, but certainly very few in that group are voluntarily there. https://worldpopulationreview.com/country-rankings/poverty-rate-by-country

I do agree that Lemmy is very much an echo chamber of "capitalism bad", but the US is also quite extreme in terms of wage and wealth disparity. It's hard to believe your country is great when 10% of the population holds nearly 67% of the nation's wealth, and the bottom 50% holds only 2.5% of it. That's extremely polarized. https://www.stlouisfed.org/institute-for-economic-equity/the-state-of-us-wealth-inequality