Is the Agreement with Iran a Mistake?

The latest world news political in nature is the agreement that several nations, including the U.S., made with the country of Iran. Sactions are being eased and the U.S. is releasing at least 7 million dollars to Iran for the agreement.
One of the main talking points of the last general election was that of Iran, moving forward in its ability to enrich Uranium. Every nation has agreed up until now that Iran would have to stop all ability to enrich Uranium. The United States, along with several other countries now agree to allow just a slow decrease in processes but Israel, namely Israeli Prime Minister Benjamin Netanyahu told reporters. "It's not made the world a safer place. He is totally against the agreement, and for this matter, personally I agree with him.
Personally, I believe that this agreement is a mistake. Yes, it is a historic agreement, but what was President Obama thinking when he agreed with Teheran over their nuclear ambitions? Why would the United States even for one moment trust Iran to follow through with disarmament concerning nuclear weapons? The President's approval rating is now at an all-time low in his presidency, and polls show that the President cannot be trusted, and that he does not tell the truth. Yes, these are tough times for the President, and making such a bold move such as this, to be part of actually pardoning Iran in a sense, as the Iranian Supreme Leader Ayatollah Ali Khamenei unleashed another volley last week in Tehran. Khamenei said Israeli officials "cannot be even called humans" and referred to Netanyahu as "the rabid dog of the region." What is the sense in straining relations with Israel over a country like Iran that has radial leaders such as this? Yes, they now have a new leader, but he has less power and influence in the country than Khamenei does. I was under the impression that the stiff sanctions were working, and if they were, why would any country ease up on them unless Iran truly gave up on ALL nuclear ambitions?
Since starting this blog during Obama's bid the the White House the first time, I have literally been in agreement to all of his policies and have agreed with him on just about everything. But for the first time, I am in total disagreement with the policy just instituted by several nations, including the United States with Iran.
I can only be hopeful that this agreement will lead towards further reduction of nuclear activity in Iran, although I believe that this agreement will surely prolong actual reduction, as Iran now will be under less pressure to do so. The only quick way would be to sanction them as much as possible until they finally realized that they have to stop their process of enriching Uranium. The United States in a sense have given Iran a license to do just that, to slow their process of eliminating Uranium enrichment.