It makes sense, though. Many therapists took an interest in the field either because of their own issues or those of someone close to them.
If they've lost (or feared losing) a loved one to suicide, I can understand being anti-choice. Same if they feel strongly that treatment dramatically changed or saved their lives, or if they've watched that happen for others. Most of them probably believe quite strongly in what they do. (If it worked for them, or that guy over there, ostensibly, it could work for you too.) There can also be substantial professional repercussions for a patient's suicide.
I hate that the last few that I've seen force me to see someone else as well (so that they can "consult" or whatever). It's expensive, feels uncomfortably patronizing, and I feel like the efficacy is greatly reduced. But I get it. I'm a high chronic suicide risk with a history of self harm and little preservation instinct who won't reach out and gives few clues in the moment to how bad things are. They'll find out about a crisis months after the fact, if they find out at all. Unreliable narrator. Someday, I will almost certainly die by my own hand. And they will never see it coming. I'm a shitty, high-stress patient. I wouldn't want to see me either... even as a pro-choicer. It's one of the reasons I don't go anymore. I feel like it's almost unethical for me to choose a new therapist with the knowledge that I fully intend to off myself. I can't bring myself to knowingly risk inflicting trauma and/or negative repercussions on somebody who is basically an innocent bystander that just wants to help. I don't know.
Enough blathering on my end.