Point of order: No human being can be "illegal". Their very existence can not be illegal.Their immigration status in the US can however be illegal.
Reducing a group of tens of millions of people to a single (negative to you) characteristic is dehumanizing as fuck. The people are parents, sons, daughters, our coworkers, students, worshipers, tax payers, and members of our communities. They are saints, sinners, lovers, fighters, dreamers, assholes, heroes, and yes at times criminals. In short they are human beings exactly like you.
When you continually dehumanize this population by referring to them as "illegals" as if there is only one single characteristic about them that matters you create the conditions that support mass atrocities like concentration camps that are already rearing it's head in our modern day America (e.g. Alligator Alcatraz).
I know you're better than this. Please consider not using language that helps dehumanize tens of millions of your fellow human beings.