I'm an attorney in New York City who primarily works with the survivors and families of deceased victims of 9/11 and the aftermath. I am also a Muslim. I can tell you, first hand, that what the Federal Government did (tell first responders that it was safe to go to the area without any protection) is exponentially worse than what the terrorists did. More people have died of cancer since 9/11 that the people who died on the day of the attacks.
I also understand your concern for safety in this country. What is your explanation for the fact that citizens of 7 countries named in the ban have not committed an act of terrorism in the U.S. for over 30 years? What is your explanation for the fact that none of the 9/11 hijackers came from any of the 7 named countries? What is your explanation for the fact that all of the countries from which the 9/11 hijackers originated are not included in the ban?
If your concerned about safety, then yes, you should be very very concerned. This ban does nothing to alleviate any safety concerns.