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Things can have multiple reasons. Self check out can both be more convenient for customers and so companies can spend less on staffing costs. Both things can be true.
To /u/PinkCrystal1031, Your post is under consideration for removal for violating Rule B.
In our experience, the best conversations genuinely consider the other person’s perspective. Here are some techniques for keeping yourself honest:

Instead of only looking for flaws in a comment, be sure to engage with the commenters’ strongest arguments — not just their weakest.
Steelman rather than strawman. When summarizing someone’s points, look for the most reasonable interpretation of their words.
Avoid moving the goalposts. Reread the claims in your OP or first comments and if you need to change to a new set of claims to continue arguing for your position, you might want to consider acknowledging the change in view with a delta before proceeding.
Ask questions and really try to understand the other side, rather than trying to prove why they are wrong.

Please also take a moment to review our Rule B guidelines and really ask yourself - am I exhibiting any of these behaviors? If so, see what you can do to get the discussion back on track.  Remember, the goal of CMV is to try and understand why others think differently than you do.