It needs to be said: the United States supports dictators! There is no greater example than by looking at the country of Egypt. Egypt just finished toppling a dictator (Mubarak) who has been receiving substancial militaty aid for years, second only to Israel in the Middle East. Take a look at the numbers:

In millions of dollars (16,836 represents $16,836,000,000).

Now, if you want some detailed historical data, take a look at the U.S.’s Military Assistance, 1947–2010. Notice how much aid we gave Iran during the Sha’s tyranical rule.

Notes:

United States Census Bureau
The 2012 Statistical AbstractThe National Data Book
Foreign Commerce & Aid: Foreign Aid
http://www.census.gov/compendia/statab/cats/foreign_commerce_aid/foreign_aid.html

USAID – U.S. Overseas Loans and Grants
Detailed Foreign Assistance Data
http://gbk.eads.usaidallnet.gov/data/detailed.html