Re: Focus your hatred on Cruze, not on Republicans. He's 1 lone loudmouth.
The problem is that the Republican Party has created the environment where a creature like Ted Cruz can achieve a position of power. Just like Trump (and like most of the Tea Partier reps in the House and Senate), he's not a freak occurrence - he's an inevitable result of the direction the party has been taking since before Reagan took office.
The near-constant attacks and dishonest set-pieces Newt Gingrich made his name with back in the 1970s were designed to damage the credibility of the Establishment politicians (who were mostly Democrats at the time, during their long control of both Houses); this long campaign eroded the Republican base's willingness to trust any politicians on either side of the aisle. The increasingly hostile partisanship that characterizes US politics (culminating in Birtherism, 'Obama the Muslim' and 'he's the Antichrist') allowed the republicans to constantly claim that the ends of keeping the Democrats out of power justified ANY means (which now apparently includes Trump encouraging Clinton's assassination). And outfits like Fox News encouraged the base to completely disconnect from reality and believe anything they wanted, building a giant echo chamber that allowed an increasingly white, male and elderly base to ignore how the country (and world) was changing around them, to the point that 40% of republicans no longer believe the weather forecast (no, not don't believe in anthropomorphic global warming, that's like 70%. 40% of them don't even believe the temperature data on the news anymore).
Things like Cruz can thrive in that sort of environment, as his supporters will line up behind 'outsiders' because they hate actual politicians. They'll agree with anything that seems to be 'taking it to the democrats' because they don't care what democrats actually say, they automatically take the opposite view point. And they'll ignore the fact that he's not talking about anything remotely close to the truth, because they no longer care what the truth is.
So yeah, don't blame the Republicans for this particular load of cobblers, because many of the responsible Republicans know it's near-suicidal to push a government shutdown 50 days from the election. Blame them instead for creating an environment in which someone who says these things can get close to power.