At the risk of going off topic here and actually discussing the show rather than whinging at each other...
Yeah, but when they build up Rick et al to be SME's about living outside the walls and dealing with Zombies, and the citizens of Alexandria cede control to him for this 'expertise' and then his plan is to take a somewhat controllable situation and then make it less so, by releasing the zombies, then it doesn't stack up.
There was even a point in last weeks episode where Morgan chastises Rick after the walkers attack them with words to affect of "I thought you don't take risks" ignoring the fact that they were right in the middle of taking the biggest risk yet. I see that people on this thread routinely anoint the show with "best show ever/on tv" and yet there are some massively glaring plot holes, inconsistent characterisations which is clearly an indication that it's not.
Managed to avoid this weeks episode as the missus was sick and watched it during the day before I got home.
I think that's one of the points the show is starting to raise though. They have been on the road that long and done that much that the walkers are viewed as nothing more than an manageable annoyance, now that the fear is gone the group see the main threat as being other survivors. Look at the point where Morgan brings up taking risks, Rick is trying to get the new bod's over their fear of the walkers by directly confronting them while they are in small numbers that can easily be killed, in the first season or two the group reacted exactly the same way as the new ones. Its only in the later seasons you see them waltzing up to walkers barely paying attention and stabbing them in the head.
Rick, Carol and a lot of the group are now down for straight up murder to protect the group. Fuck morals, fuck right and wrong, do something they perceive as wrong and your done for. As they said, if the vote in Alexandria didn't go well they were just going to take it. I binged last season from the break up to now so not sure what episode it was exactly but they are riding with someone and Michonne checks if they asked the 3 questions. A subtle reminder that they haven't asked the 3 questions for a long time because they don't give a fuck anymore, its survival at all cost.
Morgan has come back in to counter that viewpoint, he's already showed how opposed he is to killing humans, and he's gently confronted Rick a couple of times. He believes the risk is worth taking letting people live, believing that there are good people left and that you can't just go around killing people, whatever the reasoning. As someone separate from the group but has known Rick for longer he's perfectly suited for a different viewpoint that can argue the toss with Rick while keeping Rick's respect as a valuable asset to the group, if Morgan acted how Rick does now Rick would have been dead a long time ago.
It feels like they've been building this up to a level where the main cast are drastically underestimating the walkers. Their increasingly default answer of 'kill it' wouldn't work here and their self belief in their ability to survive when against walkers is bordering on arrogance now to the point they think they can just herd 1000's of walkers about the place and have nothing go wrong, partly I think because if something does go wrong they think they can revert to plan a and just kill everything and the directors are using this situation to highlight that mindset.
I'm interested to see how they go forward from here now and how Morgan will try to bring Rick and the group round to a 'there has to be more than just surviving' way of thinking, I think the plot is going to focus on keeping/losing their humanity over the course of the season with Morgan being instrumental in bringing that to the fore. I'd also guess that at some point that is going to cost them big time in some way.
All in my humble opinion of course, I could be well off but that's why I don't think its shit writing!