They could only use this against ppl they are already spending LOTS of money monitoring.

How do you get the trojan on the relevant box? House breaking is the only guaranteed way. How do they get the info out of the trojan? Many ppl have a router+firewall sitting between the computer and the network.

The people you need to be worried about won't be visiting www.jihad101.com (apologies if that actually exists!) They'll be very well trained already thank you very much thanks to the CIA.