To allow the person you’re disagreeing with the feeling that they are still special little snowflakes whose skewed views are still appropriate to have because you never once actually made a statement that properly disputes it, allowing anything after the word “and” to ricochet right off of their skull and straight into oblivion.
It’s like some people never learned how to use “but” without being /offensive/ about it. Similarly, it’s like some people never learned how to receive a “but” statement without being offended.