Being stupid and wrong in a manner deliberate and designed to evade the truth and confound reasoned argument which would expose ones hypocrisy is a powerful strategy often used.
It can provoke a hostile emotive response and make the recipient as a result look defensive and weak.
But it also exposes the perpetrators inability to defend and argue their position from a position of fact based reason.
Thier deliberate stupidity is designed to divert and confound discovery of the truth...and to even ridicule the process of such discovery.
It is in large part the weakness and bias of the observers of such a dialogue tolerating such manipulation that gives the troll a chance of appearing the victor even while they are inherently compromised.

If someone does it on purpose they're not being stupid tho, they're playing stupid.

I know people that are stupid and often wrong. I forgive them the same way I forgive smart people that are wrong.

Unfortunately, I also know a lot of people that fake it, then bait you, then stab you right through the eye and finally feast on the remains of what their bubble thinks was your reputation. It's mostly troublesome when people with large bubbles do this, or when your boss is in their bubble.