Since I don't come from a culture where marriages are arranged, I can't really say that I understand why that happens or whether or not its "right" -
So, I'm just going to answer this from my perspective. I personally wouldn't think its fair to be controlling who your children marries because you're infringing on their right to choose who they want to marry. All it really comes down is that their love, their romantic pursuits, and ultimately their autonomy is not yours to control.
I think traditions are a tricky subject, especially if the child follows and agrees with your traditions - if the child is willing to give their consent to their parents on who they marry, as weird as that seems to me, then that's their decision. Obviously though, if they want to choose who to marry, then traditions are rather irrelevant - just because someone might have come from a certain background in which a custom contradicts with what they want, then its not within the tradition's authority to control that aspect, because it just simply wouldn't apply to them.
I'm not entirely sure what you mean "is love restricted", because there can be a lot of answers to this, so I'm just going to go out on a whim and say generally, yes, many forms of love are restricted. In a lot of places same-sex love is prohibited, then there's age gaps, stuff like that. It should be noted that not all restrictions on "love" are bad, because if there weren't, then adults who claim to "love" a child could freely express their pedophilia. It all depends on context.