Yes, Trump's speech indeed was scary.  He actually made a long list of things that need to be done--which might give people hope.  But these are entirely unfunded, exceedingly vague points.  They say 'if it sounds too-good-to-be-true it probably is...
Gauging from Trump's actions during 18 months of campaigning, he expects everyone to fall in line behind him at his every word and anyone who questions his statements is immediately treated as an enemy.  
He may back off for a while--or others may say something different--but concerning the immigration issue we now have TWO statements--that of Trump and that of Homeland Security Director Kelly.  Police can choose which they wish to follow.  
Trump is a con  artist. He doesn't believe the rules apply to him.  He is skilled at lying and sounding like a good honest person when he's manipulating and setting up his marks.  He's so good at convincing many people that the are in a state of disbelief.  A world class danger as a world leader