Trump distinguished himself from the rest of the GOP field by taking the most extreme stances against minorities, women, and foreigners. And by using the most extreme and despicable tactics (ie: Cruz's dad murdered JFK) which made the frothing GOP base swoon. That's why you're seeing such mass protesting. Trump won by appealing to the worst of humanity.
All your little bullshit about "jobs" and "law and order?" EVERYONE in the GOP field was promising that. But Trump, a complete joke and least popular of the field at the beginning, knew what conservative voters really wanted to hear.