They were in a big ass PANICK and Carter Page fit very nicely into the plan. They needed someone who had been to Russia, had other contacts with Russians no matter how incidental it was. It's all they had to work with. They were more than willing to sacrifice Page. He is a Patriot and they gave two shits about him. Same with Manafort, Stone and Flynn.
All of these slimy, filthy traitors of America need to HANG by the neck til Death.