Why do people kill themselves just to kill you?

I've had this happen so many times today in solo games. Someone will basically commit suicide just to kill you. For instance:

• The circle is coming for both of you. You shoot at each other. The other player doesn't run to the safe zone and instead shoots you while you run. He doesn't kill you but he hurts you enough so that you die to the circle. Then he dies outside the playzone.

• (I had this happen in a game today) Someone landed at the same remote group of houses as me. He goes to a different house and I hear him running to me a few seconds later. I have a micro uzi and spray him down as soon as he enters the room I'm in. Then I explode. He suicide bombed me.

• You see two people and they see each other and you. One guy rushes out into the open to get an angle on you and kill you, but is guaranteed to be killed by the third guy, but he just wants to kill you before he dies.

It's fucking annoying especially in solo. I've had this happen over and over again.