Hello!
I was the staff who issued/approved the PK, it is very obvious at the time of the situation you had no regard for your life when you had 2 weapons pointed at you, you decided to pull your weapon out and say "No fuck off" which clearly shows you didnt value your life so the other side shot you and requested your character to be PKd as per the Fear rp guidelines, it is clear you did not have any allies and was outgunned and outnumbered, however of course the UA team has the final say on every PK appeal.
But to put it simply you did not value your life and did not take the situation seriously, good luck next time!