For many reasons, i would say yes. JUST LOOK TO THE FUTURE GUYS AND GIRLS. don’t need remind yourself from the past everyday now, okay?
Much like the older post i would have to agree, that forgiveness is a good thing. If i were in Halo, and if i were a civilian (yet still live), i would certainly join the UNSC.
At first, when i would join the UNSC, i would want to take my home back, avenge my families and friends deaths. To kill all of them, every last one. However, when things have changed. Whether I like it or not, i would have to accept the peace between humanity, and others as well.
Second, when the covenant decides to eliminate the rest of the sangheili, which caused the great schism. It would have felt like betrayal. Then the sangheili, will now know what its like when they will do the same to humanity as well. (BTW, read the comic Halo Union, it think that it’s a magnificent comic, you should read it too. If you want the link, just ask me, and ill be happy to post the link.)
Thirdly, say like, that i met a Sangheili, and that he/she is more trust worthy, forgiving, that has emotional like feelings, and felt really sorry that it has happened between the war with them and us. Then yes i would mostly for a chance forgive that sangheili, whether he or she felt either really good about what i have to say, or still feel sad, that i maybe would hug them (just sayin).