>>1289530While hydrazine and its derivates are indeed toxic as fuck, they only handled the fuel in protective suits.
Besides the toxicity of said fuel was the least of your concerns when flying these things.
First of all your oxidizer would eat away your flesh on contact, second of all your fuels where hypergols and start combustion up on contact and last but not least there is a fleet of bombers and fighters headed to you during launch.
During war time one tends to care more about effectiveness than about safety.
And to be fair it was a lot safer than the shit Sonderkommando Elbe did...