As someone who has been on two juries, I object! Jury selection is complicated, and there are limitations to how many potential jurors can be struck. There are also multiple strategies that legal teams may adopt. In my last trial, the plaintiff made a very emotional case, but the defense presented a very logical case. There were two jurors who I would say were logically minded, and we were able to influence the rest of the jury, who were tending to stick on what I thought were irrelevant points. A lawyer friend of mine said that she has seen that one or two logically minded jurors can often steer the jury, and if she is able to put together a logical case, she wants to get some logical people on the jury. (However, being a public defender, she is not always able to put together a nice logical case. She has to do the best she can with what she has to work with.)

> lawyers always try to dismiss smart people from juries?

Lawyers don't “always try to dismiss smart people from juries”, or even try to identify smart people.

They do try to remove people that they expect will be more likely than average to be unfavorably inclined to their client or specific arguments, or that they expect to be a wildcard because they will be unable to restrict themselves to the courtroom presentation.

Neither of those, in general, is particularly correlated with intelligence.