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Chris Martin 's encouraging people to love others they might not even get along with ... including Charlie Kirk 's family after his tragic death this week.

The singer-songwriter took the stage at London's Wembley Stadium Friday night ... and, he had all the fans raise their hands up and send love to someone in the world.

Martin says it can be anyone in the world in the clip ... friends, family or strangers experiencing tragedies -- like the Kirks.

Chris doubles down by saying it doesn't have to be Kirk's fam specifically -- it could be someone you disagree with in general ... advocating for an end to political violence like many have in the aftermath of Kirk's death. Gallery Launch Gallery Getty

As you know ... Kirk was speaking at Utah Valley University in Orem, UT

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