As some examples which seem logical to me, but should only be taken as examples:
A government that is susceptible to commercial lobbying is probably more likely to be pressured by banks to disallow competition with their services.
Governments that have a corruption problem might also be quietly bribed to legislate against a currency that competes with the official one.
Countries that support open source software might tend to have a "for the good of the community attitude" that matches the philosophy of Bitcoins.
For this question, it's probably important to provide references/examples (such as information about who is trying to stop use of bitcoins and why).
I see the need to ask this question to help provide a foundation for this one: Is there a list of countries that are not likely to persecute bitcoin businesses?