Some people are far too liberal with their own opinions – they’ll throw it in anywhere they can, whether they know anything about the situation or not. They’re usually the type of people who end up writing blogs.
Other people don’t give their own opinions enough credit. They really do have good ideas, good perspectives, good insights that they should share.
I think should is the right word there. Not can, or may, but should.
If your opinion really matters, if its not just some attempt to blow your own trumpet, if its actually springing from a desire to help and love and grow people… then share it! Let others in on it because it matters.