If the border is as secure as Biden claims, how come the unproblematic immigrants becomes a problem if they get help reaching leftist sanctuaries?

How come they somehow are more problematic in leftist sanctuaries compared to near the borders? Did democrats lie about how problematic these immigrants were before they reached the sanctuaries? If its just helping them getting there that is the problem, does that mean that if any leftist who transport any of these immigrants out a leftist sanctuary, that leftist did human trafficking? Or were the comments pretending helping the immigrants getting there were human trafficking also just lies?

If the border is as secure as Biden claims, how come the unproblematic immigrants becomes a problem if they get help reaching leftist sanctuaries?
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