People care because he's a public figure in a powerful position that is being investigated by the FBI.

As far as being a real criminal. Prostitution is a key factor in trafficking in persons. Forced sex slavery.

http://www.ojp.usdoj.gov/ovc/ncvrw/2005/pg5l.html
Each year, an estimated 14,500 to 17,500 foreign nationals are trafficked into the United States. The number of U.S. citizens trafficked within the country each year is even higher, with an estimated 200,000 American children at risk for trafficking into the sex industry. (U.S. Department of Justice. 2004. Report to Congress from Attorney General John Ashcroft on U.S. Government Efforts to Combat Trafficking in Persons in Fiscal Year 2003. Washington, D.C.: U.S. Department of Justice.)