Children belong in libraries to encourage them to READ. Potential noise issues aside, it’s good parenting.

No one thinks you’re Precious either. Oh you forget one important work libraries are for the public which is why the word “public” is in front of every library.

Smarten up

"A library is not a place to take them". It's hard to imagine anyone would have this notion. The public library's primary focus is literacy, especially early literacy. So kids have numerous weekly rounds of story times, author visits, endless school tours of 30 plus kids pouring through and Summer Reading Club line ups June to September.
Adults going in and out of meeting room programs can make a lot of noise as well. One of our local systems logged over 7000 people a day visiting in 2016. If you want quiet, you need a library branch with designated quiet study rooms or areas (usually newer), or find an academic library: certain floors can be dead quiet.

be nuts to have kids these days.

Don't confuse a poor parenting experience with the right for a child to be in a public library. For many children that's where they learned the world is bigger than they imagined and began to dream of a life they would never have known was possible.

imagine hating children this much.

Damn those children who are encouraged to learn and develop a love for books. They should be kept in soundproof rooms inside their own homes where they can’t bother anybody, the little bastards.

Or you could get yourself some earplugs and focus on things that really matter. Like working on your own sense of entitlement.

OP here, I meant toddlers and chose the wrong word...sort of.
First, toddlers don't even know what's going on around them, so a library is not the place for infants. Please stop talking about conditioning them to a space when they don't even have a clue at that age. That's a lazy excuse for a parent stuck withouto daycare options pushing their misfortune on the public. Just because they made a lifestyle choice they didn't thoughtfully prepare for doesn't mean I have to absorb the ramifications.
Second, yes, we should encourage children to read AND we should teach children how to conduct themselves in public places as it's reasonable to expect parents to teach children how to act with respect for the tone of the environment they are in...and that includes using an inside voice. Just because a place is marked "public" doesn't mean allowing inconsiderate behaviour.
The self-entitlement oozes out of every rebuttal on here from a lazy parent (who shouldn't even have kids) who thinks having unruly kids run amok is a right. It's not. Public places aside, libraries are not playgrounds or daycares. They are for reading. And noise-cancelling earphones cannot block the disrespectful obnoxiousness of a self-entitled parent and their kid being encouraged to chat loudly.
You chose to have kids, not me. Don't ram your burden on my life. If you can't afford daycare, you shouldn't have had a kid in the first place.

Look in the mirror. If anyone is oozing self-entitlement it's not the folks in the library. It's the person staring back at you in the mirror.

Find someone making a "parents should have to pass test argument," flip over the rock and look underneath, it's always thinly veiled contempt for the poor, which here becomes even clearer in OP's follow up comment where the parent is condemned for not having daycare - in Vancouver! Ahahahahaha. I know you parents out there are laughing along with me.
The only self-entitled one is you, thinking the public library is your personal reading room.