First of all, people have arrow keys muscle memory from all other programs. Saying "dump it" is as obnoxious as it is stupid; it only makes enemies and gives a false impression of Vim's power.

Secondly, the mouse provides the fastest method of random access on the screen; even things like EasyMotion only barely reach mouse speed. Such nonsense gives the idea that Vim "should not" be used with a mouse, which again misrepresents Vim.