I guess because there are many things we can apply to luck. We can call it luck when a team wins a game where they were mostly dominated and outplayed but we can also call it luck if the team that did dominate still manages to hold on to a result that could have been easily outdone in a key moment (such as a penalty). We can say, for the defending team, that a striker missing a sitter is luck, because from the defending team's point of view, they couldn't have influenced it, even though there's no actual luck involved in how well a striker finishes.

In any case, it's only natural to be biased toward the teams we support. Every fan of any football team usually goes over every little mistake made on every goal they concede, but will only focus on how amazing that striker is when he scores one for them, even if it's nothing special.

With that said, I think there's a lot more to blame on defenders for Hazard's goal in the EFL Cup than Sturridge's in the PL, simply because of the nature of each goal. Sturridge's was a long-range strike from a difficult angle, so it's hard to put a lot of blame on Kante for not putting a foot in, because no one would ever expect him to score there, especially when the defense is more focused on threats like Firmino and Mane, players who carry a bigger reputation. When it comes to Chelsea, though, there's no bigger threat than Hazard, so any defender should always be concentrated in stopping him and certainly not letting him run into the box unmarked on his stronger foot. Don't get me wrong, it was a great goal from Hazard, but I was just annoyed by your comment about him "making our players look shit", when the player who was on him, Alberto Moreno, is widely considered crap by most Liverpool fans.

So when I say Chelsea was lucky to hold on to the result despite Rudiger, Kepa and David Luiz doing their jobs earlier (though I do think the David Luiz one was more down to luck and Firmino's subpar header than great defending), it's because "luck", in this scenario, is being applied to the run of play, to how much each team pushed for a goal and stuff like that, even if the specific situation outcomes didn't come down to luck at all - but when I say Liverpool was lucky to draw against City, it wasn't because of the general play, rather it's because of one specific moment where things could (and should) have gone differently. And when I say Chelsea were lucky to win in the EFL Cup, it's because of refereeing. So, many different kinds of luck there.

In the end, I'm glad we're level on points with Chelsea and City now. We're not even close to our best, but are still top of the league and those two are yet to play each other.