It's a slippery slope, if you're the main suspect in any case by talking all you're doing is giving them information which they can use however they want against you. If you give them no information the burden on them is to dig up whatever they can, if they can't, too bad. For example, in this case clearly the author is technical enough to have perpetrated this crime, and by divulging your technical knowledge you just make yourself more of a suspect.
Also, better to have a lawyer with you advising whether you should answer such and such question. Remember, the police are not your friends, as much as they would like to make it seem that way, they want to charge someone with a crime and close the case, everybody says their innocent.
It's real tough as lawyers are very expensive, and the police, feds, etc. will make it seem as if you don't need one, lies, all lies. At most, say it wasn't you, I was at such and such, any further questions, refer to my lawyer.
You are confusing the court and the cops. Everything you write is true about court. But it's not true regarding cops.
Cops do not need proof to arrest someone, they simply need to be suspicious. You want them to not be suspicious of you, and the easiest way is not to act guilty.
Asking for a lawyer does not fall under probable cause, which is what they need to arrest you. "He looks guilty" is not probable cause. And if they already have cause, you really want to have an attorney present. I don't understand why this isn't completely obvious.
I'd suggest taking the time to speak to someone in law enforcement about how difficult it actually is to perform arrests. I think you would be surprised.
The police were already suspicious of the guy as he received a letter in the mail to come down to the police station. Why are you so insistent on talking to police without a lawyer? People watch too much TV to think that "not acting guilty" will get you bonus points in the real world. Also, police job performance is not measured by letting innocent people go. It's measured by arrests and convictions.
Also, better to have a lawyer with you advising whether you should answer such and such question. Remember, the police are not your friends, as much as they would like to make it seem that way, they want to charge someone with a crime and close the case, everybody says their innocent.
It's real tough as lawyers are very expensive, and the police, feds, etc. will make it seem as if you don't need one, lies, all lies. At most, say it wasn't you, I was at such and such, any further questions, refer to my lawyer.