1) Grizzlies are known to ear marmots if they can catch them. Those bears are able to move big stones. One bear that would specialize on open the tunnels and chase the rodents on their nests, could trigger the demise of the wild population in months or weeks. Even before we could notice it.

2) Bears will compete for the same fruits and resources in autumn and have big appetites. Marmots need those fruits to survive winter.

3) Vancouver Marmot societies can collapse suddenly if the number is reduced, because they need a minimum number of watchers for protection while the other eat.

The risk simply doesn't worth it at this moment. Professional advice should be relocation of the bears until the marmot situation improves and creates a minimum number of individuals that would act as a safety buffer. Those bears at least should be radiotracked ASAP and followed by Biologists and specialized workers. That would be the minimum action required. If they enter on the area with marmots they must go. Prioritizing safety of the critically endangered animals over the common species is the correct decision.