Why do you think that God wouldn't send us more prophets?

Why if someone says he's a prophet you immediatly would start pointing that person is a fake prophet. In Mathew 7:15 it says that you will recognize them (false prophets) by their acts... What if the person that is claiming to be a prophet is someone who is a great role model for others and only preaches peace and good messages, someone that has dedicated his entire life to serve to his church in a righteous way? If God used to send us prophets before, why not doing it now? we always need some guidance!