Fast Forward is like some legal nitro-booster to go fast. Yield is like legally punching someone's tire.
Because Yield is an action by one team against a specific team, it does make it personal. I think that is part of the producers' intention.
scenario: You are yielded and you survived. Will you remain cool and objective or will you vow revenge by yielding the team that did it to you?
scenario: Your team found out Jack n Jill yielded the team you get along with well, Hansel & Gretel. How does it affect you?
We are more forgiving of Fast Forward because it's part of TAR since the beginning. Also, movies like Fast and the Furious make use of those nitro-booster thingies, so we feel okay.
Fast Forward is used for survival. Yield is a defensive/offensive mechanism.
I think that is why we don't mind FF more than Yield.