So, you're saying that if you are pulled over for "swerving", possible DUI and you haven't been drinking at all or taking any drugs, you should still refuse to answer questions, take a field sobriety test or a brethalizer?
With that advice, I'd automatically lose my driver's license, possibly my concealed carry permit (or ability to renew) and guaranty to make some lawyer $5-20,000 richer.
Also, being investigated for possible DUI is very different than being investigated for shooting in self-defense, unlawful possession of a firearm, trespass with firearms, etc.
What if I'm out hunting and accidentally wonder onto someone's land where, in some places, its posted "No Trespassing, Hunting, Fishing, etc."? Police officer gets called out and finds that I'm trespassing with firearms. Should I remain silent? Ehhh, I don't think I'm going to remain silent and demand to talk to my attorney. I think I'm going to put my gun down gently, do what the officer says, be as cooperative as possible, try to explain my mistake and try to explain that I didn't intend to do any harm. I may get arrested anyway, but with my approach, I have a better chance of dismissal or leniency if/when I get before a judge.
This "one size fits all" approach is a bad approach in my opinion. People always need to use their own judgment, depending on the circumstances and many other factors as to which approach you should take with the police.