Because Merkel let in all those migrants and crime sky-rocketed- right?

WRONG!

Germany's crime rate, particularly violent crime, is far lower than in the United States. The U.S. murder rate, for example, is nearly six times higher than Germany's, according to the most recent report by the United Nations Office on Drugs and Crime.

Government data show that despite a 440 percent increase in migrants, crime among that group only increased by 79 percent last year.

We found out that the German government has repeatedly studied the question of crime and migrants.

According to the Bundeskriminalamt, also known as the Federal Criminal Police Office or BKA, crimes by immigrants rose 79 percent in 2015.

But at the same time, the number of refugees in the country rose more than fivefold — by 440 percent.

In other words, the typical German was more likely to engage in crime than the average migrant.

That doesn't really fit your narrative, does it...? But it DOES fit with the fact that Trump is catering to the white supremacists and speaking their language:

In fact, Trump’s new line about Clinton wanting to become “America’s Merkel” can be found almost verbatim in these white supremacist forums. “If Hillary takes power she will be to America what Merkel is to Germany,” a member of Stormfront wrote in March. “Hillary Clinton is America’s Angela Merkel,” wrote a commenter on American Renaissance in April.

Heidi Beirich, who investigates and tracks white nationalist groups for Southern Poverty Law Center, told ThinkProgress that Trump “seems to be parroting the hate sites” and speaking to their concerns.

“There is no question that the people who call him their ‘glorious leader’ know exactly what he’s talking about,” she said. “That is the audience that is concerned about this issue. Merkel is hated by Trump’s white supremacist supporters, and she and Clinton are seen in the same light.”

Less than a year ago, Trump had nothing but effusive praise for Merkel, calling her “fantastic” and “probably the greatest leader in the world today.” Weeks later, after Merkel announced that her country would accept hundreds of thousands of refugees, Trump changed his mind, slamming her for “ruining Germany” and calling her a “catastrophic leader.” This week, he claimed that “crime has risen to levels that no one thought would they would ever see” thanks to Merkel’s refugee policy. But official data shows no increase in crime over the last year, and the number of crimes committed by migrants has declined by more than 18 percent between January and March of this year.
Donald Trump’s campaign did not respond to ThinkProgress’ questions about the origin of his comments on Clinton and Merkel.