It depends on context. To me the two scenes show life for Ellie. In one she is having "normal" life hanging out with friends and attending a dance. We get insight into her relationships and her state of mind. Ellie went through hell in tLoU making her among the most hardened people in her world. Yet, she is still shy and unsure of her own sexuality. Where does she belong, kissing at a dance, or murdering in the field? In one she is awkward and uncomfortable coming of age, the other she is a seasoned veteran at ease with what is required.
I think if you watched that and found the kiss more provocative than the brutal execution it can be viewed as how our priorities as a culture in gaming are skewed.