Proposing using a system with no due process to limit a right of US Citizens when it would not have stopped what you are using as an example is hysteria. Saying putting a hold on migration from a region is not. Saying that it should only be Muslims is stupid, but not hysteria as such a change would have actually made a difference....
Hysteria is exemplified in getting all angrified on the TeeVee pointing your finger at a pulpit, saying that "THIS IS ENOUGH" and demanding a change that would have made no difference to the attackers but will limit the rights of citizens.
Trumps silly plan based on asking entrants to the Country what religion they follow, is a direct response to those angry voters pointing their fingers at the TeeVee, the hysterical voter.
Common sense gun Control has a higher likelihood of help the problem, trying to ban a fifth of the worlds population from coming to the USA based on self reporting of religion, would not.