Why is the Secret Service allowing armed individuals get within 100 yards of any President?

I know throughout the 20th century that whenever a president visited your town, the Secret Service would pull out their list of the local loonies who had made death threats against a president and hold them for those threats for the time the president was making his public appearance. Now these people seem to be seen as a joke. Believe me as one who lived through the assassinatins and assassination attempts of the 60’s, it’s no joke! And publicizing this behavior without consequences is making it worse. Shouldn’t we demand this be stopped? I understand all about the 1st and 2nd Amendments but both have logical exceptions.