system
Given the following post, respond as if you're commenting on Reddit:
human
[Captain America: The Winter Soldier] Did the bad guys really think their plan would work?

So they plan on taking over the world by being able to file a missile against anyone in the world who presents a threat... and they think that will work? Let's consider the scenario where Cap doesn't heroically get the last chip in place.

Cap was aboard a carrier and could probably take over the whole thing himself, if he needed to he could spend a few hours tearing it apart from the inside and the carriers couldn't target him.

Tony Stark is just going to sit around and let some chumps fire missiles at him? I think he's probably had enough of that after the Extremis incident and now knows anytime a missile comes within 100 miles of him at any time. Even without a suit he could probably get to safety since the network controlling the helecarriers is driven by satellite imaging, which Tony would probably know.

What if Heimdall hits up his boy Thor and lets him know that his girlfriend just got blown up along with his superfriends? Hope those helicarriers' systems are well grounded, might by them a few minutes before they get torn to shit.

And what the HELL were they going to do about the god damn hulk? You try to blow him up and he's just going to smash your cute little "world conquering" weapons into tinker toys. Or don't target him and he gets pissed at what's happening anyway.

Hundreds, maybe thousands of the greatest minds orchestrating the hydra events and not one intern raises his hand and asks "What if the superfriends don't just sit on their asses and take our shit after we try to kill them and everybody they've ever loved?

Was the whole thing a distraction to keep Director Fury's attention off of a more important plan he was close to uncovering? Was S.H.I.E.L.D. considered a threat to Hydra's real plans when Hydra's existence was a secret to everyone? Was the insurrection simply a sect of Hydra that got too big for their britches and decided to take action before they had the cards to succesfully do so? 

Captain America saved hundreds of thousands, perhaps millions of lives. But let's face it, he certainly didn't save the world and probably didn't even save anyone of great importance to the MCU.
gpt
While MCU Earth is a lot more protected than ours, it's also a lot more threatened. Presumably Hydra believed that the Avengers were too distracted by *other* civilization-ending catastrophes in their own franchises, and they'd get the drop on them.

These helicarriers probably could have taken out Stark before he knew what was going on (he's a busy guy, he's not omniscient, and he's not even particularly careful about going outside without his suit on).

As for Thor and the Hulk, there's no reason to assume Hydra really understands the scope of their capabilities--they probably just underestimated them. Hydra is nothing if not hubristic.

(Also note that in the post-credits, they appear to be breeding superhumans with Loki's staff, so they had at least that up their sleeves.)