If Kavanugh is not guilty why did he evade the question of taking a lie detector test if he was not

[kimbutgar]

Guilty? I’d say test away if I was innocent. Me thinks kavanaugh is guilty, guilty and quilty and a lying sack of shit. The pos molested and attempted rape on many women who are too scared to upend their families and careers if they came forward. I applaud Dr. Ford for her bravery.

[NanceGreggs]

1. He's a proponent of using ...

... polygraph tests. He's said they're a reliable tool in determining truthfulness or deception.

Of course, when asked about lie detector tests today, his response was that they're not accepted in court because they're unreliable.

[dmr]

3. Right. He (and the GOP) are afraid of being caught with his pants pulled down.

So to speak.

He's got a lot to lose, and it's so much easier (and safer for him) to blame the victim, Democrats and who knows who else than be caught in his lifelong deceptions.

I am convinced he is a criminal. The worse kind. An alcoholic, mean, self-serving predator.

He knows it, and we know it.

[Frustratedlady]

2. He also evaded answering whether or not he has a drinking problem.

He went into what a great student he was, his present accomplishments, etc., but did not answer the actual question. He did say he liked beer, but didn't reply to whether or not he'd blacked out or forgot what he'd done after drinking a lot.

Also, he never answered if he would agree to an FBI investigation.

He has a bad habit of repeating the same thing because he was trying to eat the senators' time up.

[JHB]

4. I think it would have raised more alarm bells with me if he had agreed...

They can be spoofed, especially by practiced liars. One of the smears against Hillary was her supposedly laughing at a rape victim from a case in the 70s. In the actual interview, what she'd ruefully been laughing at was how her then-client, the perpetrator, passed a polygraph test with flying colors, forever shattering her faith in the things.
https://www.factcheck.org/2016/06/clintons-1975-rape-case/

Kavanaugh seems the type who would either completely deceive it or make it swing like seismograph monitoring a 9.0 Richter scale earthquake. Nothing in between.