On the one hand, it's unfair to harp on the 2 consecutive last-place finishes for Farrell as the FO in both seasons pretty much engineered that result by mid-season dismantling of the teams and conducting open tryouts in the latter months.
That's not really how it went down over the past two years.
The idea of "dismantling" a team to "engineer a last place result" fits the 2012 season, when Valentine had the team 2 games over .500 at the deadline, and then after they traded Punto they went into a freefall. That's not how it happened in 2014 and 2015 though.
In 2014, the Red Sox were 48-60 at the trading deadline. They were horrible before they "dismantled" the team and stayed horrible all year.
In 2015, they were 51-64 and had been horrible all year long, with a .443 winning percentage under Farrell. Then after the change of managers, they went 28-20, a .583 winning percentage. They stopped being horrible when the managers changed. There were other factors, obviously, but that is the bottom line.
At the 2015 trading deadline, there was absolutely no dismantling of a team to engineer a last place result. What actually happened is that a team with a terrible record changed managers and then went on to play much better and win a lot more games, and only finished last because they were so terrible under the original manager.
There seems to be a lot of glossing over of the last two seasons in this thread, with people talking about it being so early and they've only played 14 games, etc. For the last two years, they've actually played almost 340 games under Farrell, with about a .440 winning percentage. The Red Sox were horrible in 2014 and 2015. They were a high payroll team with high expectations in the team's own words, and fell way short of those expectations. This year they are a high payroll team with a front office that has announced that they have high expectations. If they start falling way short of those expectations again, they will change managers, because that is what teams do. Hopefully that won't happen, but they need to win games and stay in contention. Otherwise they will change managers.
It's certainly not silly to question the job security of the manager who has a .440 winning percentage over the last 2+ years. Trying to look at very single move, or at whether this guy or that guy was available or playing well for a while and maybe that other guy should have done better is irrelevant-- it's looking at the trees when the forest has been burning down for 2+ years. Either the forest fire gets put out soon, or a new fireman comes in to try.