I am a believer in the pre tribulation view point with one of the major reasons being that believers are not meant for wrath (1 Thes. 5:9 among others). However, I find that the first time the “wrath” of God is mentioned in Revelation is with the sixth seal (Rev 6:17). Could it be that the 4 Horsemen and the Souls of the Martyrs (seals 1-5) might occur before the rapture?
Rapture before wrath is just one basis for the pre-trib view. Another is the mutual exclusivity in God’s plan between Israel and the Church. This means that the Church has to be raptured before Daniel’s 70th week begins and God’s focus shifts back to Israel. Personally I see the rapture in Rev. 4, the Church in Heaven in Rev. 5 and then God’s Wrath begins on Earth in Rev. 6.