There it is; there's always that second part added to the fulfilled statement of Matthew 5:
Matthew 5:17-18
Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. For truly, I say to you, s until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished.
I have a hard time listening to anyone who says that all is currently accomplished, because we've got quite a bit of prophecy left to go. The fat lady has not sung yet.
There is a difference in putting something away and fulfilling it. If you say I put aside my obligation or put away my obligation, that means something distinct from I fulfilled my obligations. You folks are correct in saying that we are under the New Covenant which means that our Savior died for our sins on that cross. The key aspect of that is that while he fulfilled the ordinances of sacrifice, those laws still stand as he attests to immediately after the above verses. Just to give an example:
Matthew 5:27-28
You have heard that it was said, ‘You shall not commit adultery.’ But I say to you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart.
In other words, if it's put aside, then why does Christ waste time expanding the scope of the law? IE: It's just as bad to think about the act as it is to actually participate in it.
Newer translations butcher this verse, so I'll go back to the KJV because it's more specific:
Colossians 2:14
Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;
It's knowing the difference between law, statute, and ordinances. Unlike the modern translations, you cannot lump some multiple different words into laws because there are a number of verses where the different terms are used like Nehemiah 9:14 KJV.
Like it or not, the law is a part of the New Covenant. Just have to study and understand how it works. The law cannot be looked upon as it was in the OT and in the days of the Scribes, Sadducees, and Pharisees. It's not a collection of rules meant to be followed to a T (or iota). It's our God's rules on how to live a good life, given to us so that we'll listen to our Father. Frankly we're going to mess up, and that's where Christ came in because he took away the need for daily sacrifices and other rituals. We have that rest in Him now whereby we are free. That simply doesn't mean that "Thou shalt not murder" etc. are of none effect.