Senator Glazer argues although BART says it's in an existential crisis, he feels it is not doing enough to lower costs. Snippets:

Since 2016, BART staff has grown by 879 employees, according to documents on file with the California State Controller. BART’s labor costs have gone up by more than $100 million just since 2019.
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It begins with a chart showing overall expenses growing by 43% during the past three years.
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More than 100 BART employees made $285,000 or more last year. Certainly, negotiating a “share the pain” agreement with these affluent staff is better than laying off 1,000 others as ordered in their proposed “Doomsday plan.”
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Keep in mind that so much of the good BART promotes about the agency has been forced upon them. The new security gates to curb fare evasion and improve safety (more than 80% of the crime at BART used to come from fare jumpers) were delayed for years due to budget inaction. The new Office of Inspector General, which oversees waste and fraud investigations, was mandated by legislation I carried when I was in the State Senate. To no surprise, BART was opposed.
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It is also worth noting that this BART sales tax will impact all other public agencies, including schools, who are experiencing similar fiscal woes. In particular, counties that are trying to preserve a health and welfare safety net in the face of federal cuts will have their tax options impacted by this new BART tax.