Who can you trust?

Not too long ago I remember hearing a chant being led by the group called Black Lives Matter. It went like this. "What do you want?" "Dead cops!" "When do you want it?" "Now". Anyone not suffering from Alzheimer disease must remember this chant. I also remember another chant led by Black Lives Matter. It went like this. "Pigs in a blanket. Fry'em like bacon". It is obvious that they were advocating the wholesale murder of police officers. I remember that right after they led these chants, Obama invited them to the White House so that he could expressly endorse them, with the obvious implication of also endorsing the idea of wholesale murders of our police officers. What else could Obama's immediate endorsement of the Black Lives Matter group have inplied?
Now at the DNC, the democratic parties leaders have invited the Black Lives Matter leaders to speak. This further legitimizes a radical group that has advocated killing police officers. Does this mean that the democratic party endorses the idea of murdering police officers? If the democratic party is opposed to killing police, why endorse an organization advocating it? Since Obama and the democratic party have publically endorsed Black Lives Matter, doesn't that imply that they agree with what Black Lives Matter advocates, which is an endorsement of killing police?
If I were a police officer, I would have zero trust in anyone associated with Black Lives Matter. I would have zero trust in anyone who endorses Black Lives Matter. I can't think of one reason that a police officer, a friend of a police officer, or a relative of a police officer should trust anyone who advocates killing police officers. Can you?