* Snowdon revealled much about GCHQ so you can't really expect the UK government to be any more supportive of his activities than the US one was. I don't know enough detail but suspect other countries were implicated too. In those cases they're not in thrall to the US, they're simply responding according to their own interests.
* For European countries not specifically mentioned, why would any government antagonise the US when they're probably doing similar things themselves.
* Let's not kid ourselves what the Russians are really doing. This is basically trolling on an international government scale. Putin certainly doesn't believe Snowdon is a freedom fighter, and his actions around support for Snowdon are hypocritical in the extreme given the sorts of activities Russia are almost certainly engaged in themselves.
It's unrealistic to assume any government will support Snowdon as a matter of principal. They'll do so if it is popular enough with the people of their country but to me at least this doesn't feel like something that your average person is going to get worked up about compared to more domestic issues such as jobs, the cost of living and Kim Kardashian's ass.