Claim: refusing to help when you can do so without cost to yourself is the same as hurting. Basis: conscience. If you saw someone with magical powers who could conjure food refuse to feed a starving homeless person because "it's not my fault they're starving, I'm just doing nothing", wouldn't your conscience tell you to feel anger at this person, and to steal food from them if necessary? That's all the argument I'll bother giving. I will, however, talk about the ramifications.
My favorite consequence is that this removes the right of land owners to kick others off their land for no reason. This consequence may seem instinctively repulsive to you. Therefore, I'll give another intuitive reason why you should reconsider. Suppose you live in a small circle of land, less than an acre, and all the rest of the world is 'owned' by other people, so you can't leave your area. You are therefore in prison, are you not? Where do the landowners get the right to keep you there? Even if imprisonment were a valid punishment (it's not), you haven't done anything. Does your conscience really tell you that you wouldn't have the right to tresspass?More generally speaking, there is - or seems to be - the implication that freeloading is perfectly fine, and not only that, but that attempting to prevent freeloading is not fine. I don't believe this is entirely true. There are other relevant ideas that we need to consider in those cases.
First, we need to talk a little about debt. Debt is owed to someone who has made a sacrifice to help you. You do not owe someone who helps you at no cost to themselves (such as a god with infinite power). By the same token, it doesn't count as your repayment if you help the person back at no cost to you - only when you make a sacrifice for them. Another principle is that you can never owe repayment past the point where your sacrifice is equal to the benefit you gained, even if their sacrifice hasn't been fully made up yet.
So say someone puts time, money and effort into creating say a video game and makes it available for purchase. The principle I stated at the top can't apply because the sacrifice made to create the work is now a sunk cost. However, debt can apply. They made a sacrifice that benefits you, and so you should pay the minimum of the requested price and the game's worth to you. If a game costs $10 and you'd rather spend that money than not play it, then you should pay. If it doesn't matter to you that much, you'll just go play a different game if you don't end up buying this one, then it's moral to "steal" it in a way that doesn't hurt the creator at all.
One last thing. Since the above answer leaves the decision to the player who is incentivized to steal things they'd be willing to pay for, throwing obstacles in the way of freeloaders actually is moral, despite that freeloading is too in some cases. Because there's no way to discriminate, and if you let everyone freeload without any obstacles, many people who would (and therefore should) pay are going to do that instead. That means making freeloading difficult for everyone is acceptable, because it prevents theft.