During the religious wars in Europe around 1500-1700, why did Lutherans eventually come to fear Calvinists?

It is tied to more than religion. Class, tradition, class. See
http://www.xs4all.nl/~ottoknot/werk/Labourconference.html

This was a period of great social transformation, and those entrenched in custom, tradition, feared the radical reformers who were trying to set the country upside down.

Thank you for using the Jiskha Homework Help Forum. I see you already have excellent information, however, here is an article that may help you on the differences in the two doctrines:

http://www.graceonlinelibrary.org/articles/full.asp?id=70%7C%7C863

Here is another interesting historical background:
http://en.wikipedia.org/wiki/Augustus,_Elector_of_Saxony

From the NRA (National Reform Association, written in 2001)
http://www.natreformassn.org/statesman/01/retreat.html

Finally, a "recap" of the Reformation:
http://reformed-theology.org/html/books/calvinism-history/2.htm

thanks!