As a casual user, I would like to know how I am endangering users by encouraging them to use TrueCrypt? And what should I be encouraging them to use instead?
If your adversaries want your data, FDE will help them and not you. If you have secrets that would put you in danger if revealed, you would now be danger.
The alternative is file-level encryption. The only accessible files at any given time are the ones you're using, so if you are relieved of your laptop on short notice, not all beans will be spilt.
File-level encryption is a pain in the neck to work with. FDE is much more convenient, and a pretty good answer if your threat model doesn't include "drive by laptop snatching" as a major concern. This is most people.
Sorry to nitpick, but it may confuse a casual user: FDE will not help your adversaries, it just won't help you. That is, in those circumnstances (i.e., when your disk is mounted) FDE won't have any effect.
At the point of seizure, your chosen data protection method is either helping your adversaries by offering all files unimpeded, or helping you by not doing so.
It's equivalent to having no data protection at all, if you adversaries are competent.
In my own use case and in that of people I've recommended TrueCrypt to, having the hard drive apprehended while shut down, specifically during customs checks, is a far greater risk than having the computer compromised while the encrypted drive is already mounted.
Given that particular threat model, is it OK for me to continue to use and recommend using TC?
Note that "surprised" might include a networked attack, in addition to being tackled in a coffee shop.
File-level encryption protects your data until you reach the court order level of compulsion, and possibly further. At least in civilized countries.
So, given those caveats, I'd say your answer is "yes", but...the best plan is to do both. FDE as a matter of policy, and file-level on any files of specific value.
File-level encryption constrains them to just the files you have open at the time, although of course any breach might be persistent, so they could theoretically wait around until supersecret.txt gets opened and grab it then.