Can to be omitted in the following sentence? I think it can, but I can't find many examples on the Internet.

Mark Twain said that it's easier to fool people than to convince them that they have been fooled.

  • Yes, when two infinitival clauses are linked by "than", the to marker may be optionally omitted.
    – BillJ
    Dec 14 '18 at 18:45

Yes, the "to" can be omitted.

The sentence is a parallel structure of the form "A [is easier than] B". Both A and B should be in the same form ("to fool" and "to convince"), but it's a personal choice of style whether to include the repetitive second "to".

Another example:

Warlord: Conan, what is best in life?
Conan: To crush your enemies, see them driven before you, and to hear the lamentations of their women! source

Note the third "to" could also be omitted, but I guess the writer left it in to add a slight emphasis to Conan's third example of "what is best in life". It's also not uncommon to add the word back in a long list:

On Sundays I like to get up late, eat a large breakfast, take a long walk, read a good book, putter around my garden, and to go to my parents' house for dinner.

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