An analogy to help with the Singed Support issue
Imagine that you really like soccer (or football, depending on where you're from). You go to the park most days for a few pick-up games. Sometimes there's even a pick-up tournament on weekends.
One day, you're about to start a game, and the guy who volunteered to play goalie suddenly tells your team that he's actually going to be spending most of the game near the opposite goal, rather than defending yours.
Don't worry, he says. He's played like this a lot, and having an extra person down there is really effective - in fact, he's won most of the games he's tried this.
Is that against the rules? No, as long as he doesn't touch the ball with his hands. Can it work? Sure.
But how does the rest of his team feel knowing that they don't have goalie? Pretty nervous, I'd guess. They're missing an important position and will be extremely disadvantaged on defense. They have no idea how to play around this strategy, and the goalie isn't even giving them a choice - he's going to do it no matter what they say.
That isn't sportsman like conduct. It is rude and disrespectful to your team. If he had been playing with a group of friends who had all played that strategy before, that would be fine. Or if he had asked if the team was OK with him playing like that, there wouldn't be a problem.
But he just forced it on his team, telling them what he was going to do and ignoring any objections.
No one would be cool with that in a "real" sport. Why is that behavior being defended in League?
Respect your team. Don't force unwanted strategies on them when they aren't used to them. Ask, don't tell. Be a part of the team.