I am beyond tired of explaining this

This is a great line from an otherwise crappy movie.

To put it in context, the Ducks got a 9/0 lead in the first two periods, but because they have terrible defense (a noted flaw throughout the trilogy of movies that finally comes into play here), they get crushed in the third period when their purely offensive tactics don't work anymore and they end the game in a 9/9 tie. A tie, but it's taken as a humiliating loss because of how quickly and effectively the enemy team was able to bounce back and steamroll over them when they had such a massive lead (in hockey, apparently a 4 point lead is considered a blowout).

The concept of defense applies to a bunch of other sports, and it especially applies to League. We don't have a concept of defense in League. I keep seeing one lane or another get pushed to the nexus turrets within 15 minutes, even if said lane hasn't been super fed or anything, because defense is so abysmally piss poor. When someone says "Play defensively", they don't seem to understand what that means other than don't try and attack the enemy, and they try to "play defensively"with entire teams with champions that are AWFUL at defensive play.

If you have to run into melee to attack the enemy, you can only focus single targets and you could be killed by a stiff breeze, you are not a defensive champion. If you hang back behind the turret and just waggle back and forth as the enemy takes it before dashing in to finish you off, you aren't playing defensively. If your support has to be the one that defends all three lanes while you do... whatever the fuck you think you're doing, then your offense suffers as well.

Playing defensively means being able to prevent the enemy from securing objectives or kills, not handing them over one by one unconditionally to them. More than that, you need to make sure your offense can have some sort of window of opportunity to shatter the enemy's offense and stop their assault on your objectives or individual champions. The enemy won't suddenly just step forward arms aside and give you the kill; you have to set them up for your offense to take care of them.

"Group" is not a tactic and doesn't mean anything other than all your champions are in one spot. In many instances, that is a bad thing, especially if you are dealing with AOE champions like Anivia, Brand, Fiddlesticks, Amumu, Malphite, etc, or especially if you are an all assassin team like Master Yi, Yasuo, Zed, Talon, Lucian and Pyke, and triple especially if both are true. If there is no one to defend or reinforce your back line or main damage dealers, or if you think you can just kill the enemy no problem because "kills are the best CC", then you have already lost both the fight and the game.

Pure offense and absolute zero defensive tactics are things people have beaten out of them miles before they even catch a fleeting glimpse of bush league status, and it is a travesty that even after 10 years, these are concepts in this community more alien and incomprehensible than anything in HP Lovecraft.

And I am very tired of having spent the past five years trying to explain this.