Remember when Voldemort had a brilliant idea to use Harry’s blood for his resurrection? Well, your boy played pretty much everything there for no reason.
After existing as a lone atom for many years, Lord Voldemort understandably wanted to try and return to the world of the living as something more meaningful than your forced exhalation when you see a funny meme. For that, of course, he needed a proper physical body, and to acquire one he needed a ritual.
As a master of the dark arts, Tom Riddle Jr. opted for the good old ritual that involved blood, bone, and desecration of the grave. The sole purpose of the ritual was to create a creepy new soul vessel for someone who exists with zero body count, but Voldemort, being a mastermind, came up with a genius master plan.
The ritual itself implied that an enemy’s blood must be used, and it had no specific requirements regarding the race, age, and gender of the enemy in question. But Riddle Jr., in his genius, decided to use a 14-year-old British boy with a nasty scar thinking it would make him immune to said boy’s touch.
Not only does this seem wrong, but it was also a huge gamble on Voldemort’s part – a gamble that could have cost him everything he had achieved at the time.
The resurrection ritual was a well-documented magical practice for any Loser who had managed to lose their first body. It had clear specs, incantations, and an inventory list. When it came to Riddle Improv with Harry’s Blood, things got a lot trickier because it was a unique experience based on no research.
Voldemort knew that Lily Potter’s blood in his son’s veins made it extremely painful and dangerous for him to touch the boy: the magical protection was far too strong even for the Dark Lord.
His two (!) previous bodies disintegrated trying to interact with this blood protection, and what did he decide to do the third time around?
Pump the veins of his new body with this blood!
You don’t have to be a Flamel apprentice to see what could go wrong here. The very obvious result was that Voldemort’s new body would be born in intolerable agony and would continue to exist for a few brief seconds until it eventually disintegrated, just like the previous two.
Even if it wasn’t, he wouldn’t have been able to operate effectively while constantly being atrocious by his own blood. It was such a gamble, and Riddle Jr. had no reason to assume that his plan would succeed: it could have backfired so badly!
Wouldn’t it have been a little easier and safer to use the blood of another British wizard? Almost 90% of Magical Britain considered Voldemort an enemy, and their blood presumably lacked the magical properties of an extra spicy KFC basket with the specific intent of assassinating the glorified psycho-terrorist.