And this is why:

"There are three main problems with the welfare state.  First, it incentivizes poverty by rewarding the poor with government handouts that are often far more valuable than a job.  This can be ameliorated to some degree by imposing work requirements on welfare recipients, but in practice, such requirements are rarely imposed.  Second, welfare states are expensive.  This means higher taxes and therefore slower economic growth and fewer job opportunities for everyone – including the poor.

Finally, welfare states are magnets for the poor.  Whether through domestic migration or foreign immigration, poor people flock to places with generous welfare states.  This is logical from the immigrant's perspective, but it makes little sense from the taxpayer's.  This fact is why socialism and open borders are fundamentally incompatible.

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"The trouble is, few people understand this fundamental truth.  The people of California, even less.

https://www.americanthinker.com/articles/2018/02/if_immigration_creates_wealth_why_is_california_americas_poverty_capital.html