Yes I agree. It all boils down to our motivation. If our motivation is to acquire more merits for our dharma practice (which we need a lot) in order to gain wisdom, realizations and eventually attainments so we can benefit many. I think this selfish reason is valid. There are of course some who have the wisdom of buddhadharma but do not do anything for the sentient beings... But with the attainments and wisdom, i am sure there will come a time the karma triggers and they will do something remarkable? I don't know if it's how it works...
For example, I remembered once I had a discussion with some practitioners. Some asked, what is the point for releasing fishes and birds knowing that they will get caught again and be sold or slaughter. Then someone answered: yes, we might not save a lot but it to create the causes to inspire people to follow the act. If many decide it is a good act to do, more will be save eventually.
Then the other asked, then what about someone like His Holiness? Wouldn't he be very busy all day running around to save sentient beings? One answered, if he could he would, but he gave dharma teachings, because dharma wisdom is the source for people to have realization and mind transformation, it is more powerful than virtuous act. With wisdom, only you can help people.
So I thought wow, it made sense... No matter how we must save our self only we can reach out to people. Hence, we must first improve on ourself and along the way train our mind and actions to be virtuous, gain merits so eventually we will have more to help people.