>>690187The redpill was a tracking program used to located neo in the real world. Morpheous is essentially a religious nutjob who can't convince other people to follow him. so he kidnaps people matrix dazzles them with "magic" and then brain washes them for his cause. Which turns out to be just part of 5d chess being played by the ((((overseer))).
Not to mention if neo never took the red pill everyone he ever knew inside the matrix would still be alive.