It is one of the biggest of the "big lies" of the Left, that culture remakes people. The reality is--and always has been--that people make their culture. It is not that there is anything wrong with most of the Hispanic cultures--note the plural. They just are not suitable for people who were raised in various European--or for that matter certain Asian cultures--which reflected the unique qualities of those peoples.
It is actually the much vaunted push for "diversity," for the sake of diversity, that turns countries into cesspools.