Try to engage reasonably with other views, even if you really disagree. For example if you expanded on your first sentence and deleted the first bit 'pure ignorant writing' you're far more likely to have a meaningful conversation with someone, maybe even change their mind.
The author was intentionally writing around the fact that these "undocumented immigrants" are illegal. When someone purposefully obfuscates an issue, I'll call a spade, a spade, and say the writing is pure ignorance.