They don’t actually have absolute immunity. Malicious prosecution is an exception to prosecutorial immunity.
You should quit reading blogs and look at actual cases. Yes, prosecutors have absolute immunity:
Read, Imbler v. Pachtman, 424 U.S. 409 (1976). See also Manetta v. Macomb County Enforcement Team, 141 F.3d 274, 279 (6th Cir. 1998); Ireland v. Tunis, 113 F.3d 1435, 1445 (6th Cir. 1997) and Lomaz v. Hennosy, 151 F.3d 493, 498 (6th Cir. 1998).
This immunity extends to all decisions to prosecute except those “deliberately based upon an unjustifiable standard such as race, religion, or other arbitrary classification,” Wayte v. United States, 470 U.S. 598, 608 (1985).
I realize that you want the law to offer protection against rogue prosecutors because it would be make you feel like you still live in a free society, but your want is misplaced.
Read Van de Kamp v. Goldstein, 555 U.S. 335 (2009) as well and when you can actually pass a bar exam, get back to me.