After the game against the Panthers, Alex Smith wore a safety pin on his shirt. It's rare to see Smith talk anything but football. It's clear Alex wore it so it could be seen and so his voice/opinion could be heard.
According to The New York Times this is what the safety pin means: "The latest political fashion statement? The safety pin, an object that’s been adopted in the past by statement-making celebrities (remember Elizabeth Hurley’s Versace dress?) and the punk movement. After the election of Donald J. Trump, fears are growing that segments of his base may physically or emotionally abuse minorities, immigrants, women and members of the L.G.B.T. community. As a show of support, groups of people across America are attaching safety pins to their lapels, shirts and dresses to signify that they are linked, willing to stand up for the vulnerable."
The safety pin does not mean necessarily people who wear this are against the new president-elect, however, it is clearly saying they support these minority groups.