Yitayningwut:
1) The possuk says “V’Uhavta L’Reiacha Komocha”. The simple/pashtus meaning of this possuk is that the actual feelings of love are a purpose and end to itself. God wants us to have these actual feelings, regardless as to whether these feelings lead to actions or not. The same way the Torah commands us to love Hashem (V’Uhavta Es Hashem Elokecha), since through the actual feelings of love we bind/connect with Hashem; so too the Torah obligates us to love our fellow, since through the actual feelings of love/connection we are doing something which is inherently good.
2) The obvious reason why the Gemara states a negative comment on a Beth Din which gave Missa/capital punishment once in seventy years, is because of our moral feelings not to deliver such severe punishment on a person. So too, it’s understood that proper moral behavior would not commit Bi’ah Shelo Kidarkah even though it is permitted (I’m sure none of the sages in the Gemara had done it). Do you think any of the sages in the Gemara who might have been a Goel Hadam would have killed an accidental murderer? Why did Rabbi Yochanon Ben Zachai greet nicely every Gentile he met in the street; wasn’t it because of his natural moral feelings? Also, Rabbi Shimon Bar Yochai who returned lost objects to a gentile even though halachically it’s permitted to keep “Aveidas Nuchri”; wasn’t it because of his moral feelings?