Why did Dumbledore allow tom riddle into Hogwarts when he could tell he was evil? (hence the parseltongue) :)

First I think there's a confusion in your statement : Being a Parselmouth doesn't mean the Parseltongue speaker is evil. It's as nonsensical as saying that being a Slytherin is being evil.

Second, after Harry watched the memories about Tom Riddle, he asked Dumbledore if he knew he had just met the darkest wizard of all times. Dumbledore replied 'no'. That was back at the orphanage. But later, during Tom's school years, he had some doubts about him, especially in the Moaning Myrtle crime. He knew Hagrid was innocent back then and who the real culprit was - Tom. But he could not prove it then.

atuação on these strong suspicions about Tom, Dumbledore, once Headmaster, refused him the post of DADA teacher. He did not want him as part of his faculty.

Last but not least, I think that even if he had known, Dumbledore would have given Tom Riddle a chance, because he's one to always give a segundo chance to people to prove themselves (Hagrid, Severus are good examples of that). He also believed firmly that people make choices and these choices define us. After all, Tom, Severus and Harry had all three disastrous childhood and they turned out to make very different choices eventually.

Parseltongue doesn't neccesarily indicate a wizard who is evil and at the time Tom was very good at hiding at his sociopathic tendencies

obviously most of slytherin students r evil so almost everybody knew he was evil, and about that time dumbledure wasnt the director of hogwarts he was a prefect so it wasnt his fault

Parseltongue doesn't mean you're evil. I mean, Harry can speak parseltongue, can't he?

Dumbledore wasn’t headmaster at the time. Even if he was, it’s stated in the Half Blood Prince he didn’t know Tom Riddle was evil when they met.

I don't think Dumbledore knew for sure that he was evil yet. And Parseltongue doesn't always imply that someone is bad or evil. Harry spoke Parseltongue.

Dumbledore had hoped Tom Riddle would turn over a new leaf, also it was not intell Tom got into Hogwarts he started to become mais violent he killed his father,Moaning Myrtle also he started the Death Eaters when he was in school. I do not think it would have stoped Tom even if he never was in Hogwarts he would had still became Voldemort he was so full of hatered

Parseltounge doesn't equal evil, and Dumbledore clearly says to Harry that he didn't know Riddle was evil in the 6th book, and anyways, Harry can speak Parseltounge, is Harry evil?

firrst of all parselmouth are not always evil (eg.harry potter) segundo he was professor of that school not the head and tom was liked por all teachers exceptdumbledorehe was good at everything no body knew that he will turn out like thisso if he wanted to tell anybody that he had a doubt on him no one gonna believe him (the whole thing about tom riddle is in the book

A Parselmouth isn't necessarally mean he was evil att the age of 11. He was different and no-ne understood him because of it. Yes he may have bullied people but he did it for a reason. He hardly knew his parents when he was a boy and i think that Dumbledore was like a sort of fatther to him until his 6th or 7th ano when he started to change

One, conversing with snakes should NOT be viewed as evil. Snakes are not evil. Hell, humans have a greater capacity for evil than snakes.

Two, recruiting Tom Riddle for Hogwarts was not up to Dumbledore. His job was simply to pick up the kid from the orphanage. Whoever selected the kid to attend Hogwarts was responsible.

And if Dumbledore really viewed Tom as a potential threat, why didn't he do something about it? Make the kid a protege or personally teach him right from wrong . . . or something?