<Snipped quote by Archmage MC>
1. Because there's really just not much to protect against it. If the wizard is stronger than you, or has a stronger will, and your spells clash...you lose. Sad to say. (The only difference is Harry Potter, and how he got lucky with the protection of his Mother.) The lack of a cost is what it is, but it's just how the system works. That being said killing people (Avada Kedavra) has been known to take a toll on the soul of the caster. (Not tossing further information out to cause spoilers or anything of the sort)
2. I'm under the presumption that Liquid Luck, while it is extremely useful, is either lawbound to restrict the amount you can make because of its effects. Or it's extremely hard to make due to the rarity of the components required to concoct it. You can't make a spell of it simply because you can't, or the spell hasn't been created yet, and at that point it would only have one use so you'd have to keep recasting it. (Sounds relatively impractical)
1. Yet there are ward spells that can be bound to cloths or objects, so why is it that one spell has no ward against it, considering its the most dangerous? You'd think they'd make that one a priority to make a ward spell against, but haven't. Thats pretty incompetent considering its existed for what... thousands of years or something? And what dictates power? That is just so vague...
2. The rare components makes sense, but laws against it means nothing when the ones who are supposed to uphold these laws can be overthrown by 3 people who have no qualms about using the death curse that apparently can't be dodged or warded or defended against in any way, shape, or form. And what exactly is the point of potions when you can make a spell that does it with the only requirement being a wave of your hand? Its incredibly inconsistent with no explanation as to why or why not certain things can or can't be done. Just because "they can't" with no reason behind it isn't an explanation. Plus why didn't Voldimort, having access to apparently the entire government's resources in the 7th book, just mass produce that luck potion considering he has the entire government under his foot and be unstoppable?
Basically when you make the one who is supposed to uphold laws woefully incompetent and having little power, laws mean nothing. When you say something can't happen because it can't without any explanation, isn't a reason it can't be done. Add in they establish "this spell can't be penetrated by anything." AKA the reason Harry had to go to the dursleys every year, yet later in the books there was a spell that could easily break that same enchantment, and the only reason that was given was "because its monitored", monitored by a government with less than 50 police tied to it and very little power to do anything against anyone who spits out death curses left, right, and center, which means why didn't Voldimort just use that spell in the first place? Plotholes everywhere. :(
I'd really like some way to patch them up.