Righteous Indignation

The righteous indignation professed by leftists when any statement is made criticising immigration is simply remarkable.
I have just visited a number of websites where bile has been outpoured at anyone daring to even hint at the truth.

The principal feature of these is their tendency to:
deride, scorn, cast aspersions, mock, insult and decry. (Were we able to see them, I am certain that they would all be somewhat loud, staring and a tad wild-eyed.)
The secondary feature is the total absence of: logic, a factual base which is not highly selective and argument rather than putting cases by assertion!
When a written piece is criticised by such writers, it would really be nice if they were to actually address a few of the points raised rather than descending into ad hominem jibes. (Nonetheless 5 out of 5 from the table above is pretty impressive!)