Slow down a bit.
A. He is reported to have turned himself in to the local British police station, in other words, it was his choice, he made it after hiring a barrister (attorney) and this happened across the pond, in the United Kingdom.
B. He has more than enough money to retain a competent barrister, which means that other than the thousands of hackers who want to exact revenge upon the Internet, he has one loyal paid friend by his side.
C. Considering the alleged death threats which were made against Assange and his children, being locked up in a jail for a day or two is probably safest for him.
He fathered children?? Ididn't realize, must have missed that. Pity the kids with a sick dad like him. How awful to live with someone like that and become targets of threats because of what their quite disturbed daddy does and has done.