Can't agree with Amit Kalantri there. Love triumphs all. It's the purest, strongest, strangest and the most mysterious emotion of all. In fact, it is said that God is made of unconditional love.
Politeness, on the other hand, can be fake. There are quite a few people in history who were very polite on the outside and a serial killer on the inside. Had they had love for other people they wouldn't have gone on mindless killing.
Really? I think that some people are unlovable. Someone may love them, even the serial killer is defended by someone, but the ordinary human does not love everyone, even if that is the goal. TBH, some people can rub you the wrong way, sometimes without reason. You just know that this person is looking for your destruction, and it's hard to love someone that way.
But then, it begs the question, what is love, besides a vague term? Love means different things to different people. For the abused individual it may mean affection, for the independent person it may mean trust.
Although I bear no one any ill will. I cannot say that I love everyone, some people never touch my heart, in this case politeness will do.