The difference between a Trump presidency as opposed to Cruz or Hillary is not worth losing sleep over. Both Cruz and Hillary seem more warlike, and Hillary's handling of Libya showed that she learned absolutely nothing from Iraq. Trump has made disconcerting comments about things like going after terrorists' families, but we already have Obama who has introduced extrajudicial targeted killings (like Anwar al-Awlaki and his son) - it's not like Trump is wildly worse than the alternatives. Trump (and to a lesser extent, Cruz) would have to deal with a congress where even their own party dislikes them, and the Democrats will be outright hostile. I actually regard that as the safe alternative.
The country endured Woodrow Wilson (an extreme racist who got the country into a huge war unnecessarily) and Theodore Roosevelt (another racist and warmonger who had the populism and robust view of executive authority that people fear in Trump). A century later, those two are largely regarded as heroes by many of the same people who hate Trump.
