Why when birth control is suggested to avoid abortions people on G@G say birth control doesn't work?

sage2021
That is a pretty serious statement and it could actually discourage younger people from trying birth control. If they double up on birth control it should be pretty effective. Which birth control methods do not work and why don't they?
Why when birth control is suggested to avoid abortions people on G@G say birth control doesn't work?
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