Actually, I was shocked at the president's use of the word "vigilante". I looked up "vigilant" in the dictionary , and it means to be observant and watchful. While "vigilante", means to take the law into your own hands, especially when the government failes. Now, this in no way, permits "lynching", which is the removal of a person from police cusody, and the effecting punishment. Our court system, exists, to administer justice and effect punishment. BTW -- Hanging is separate from lynching.
Observing and reporting crimes, is the same as a Neighborhood Watch. A purse thief can be nabbed in the streets, by a crowd of bystanders, and pummeled with fists; or a local teen caught as a prowler, in my backyard, can trip over a sprinkler head, a few times, before the police arrive.
"Shocked", but after you looked up the definition, you do have to agree with the President, right - especially anyone who actually makes a citizen's arrest (or worse)? Some here want to fool illegals into thinking they are federal immigration officers, but I don't think anyone has advocated "lynching" (the worst I've seen are pictures of large catapults someone keeps posting).