We choose the evil because it is more appealing, more exciting. We don't want the 'homely' stuff - we like to play with fire, because we are so sure we won't get burned. We are so sure we are immortal.
Pride means : we lie, even to ourselves, telling ourselves that we can make our own reality, and our own truth. Independent of God. Scripture says (and Jesus warned - FIVE times in Matt.24) of a great increase in deception in the Last Days.
You get the picture? Yes, actually, we DO think we'll be happier choosing evil, because it doesn't come in the form of evil, it comes all beautiful, and attractive, and promises us more freedoms, which 'being good' don't. Being good is seen as a bind, restricting our freedoms to enjoy ourselves. It's only when we're thoroughly hooked into those evil ways, so we can't get out, that we - maybe - begin to see how bad they really are.
Bit like smoking, really; smokers know what they're doing is liable to kill them, but they're addicted to the habit (in fact, its pleasurable) and they have neither the will nor the strength to get free. So, they reek of nicotine, are short of money because they give it to the tobacco barons and are physically unhealthy. That's sin - and its brainless - but don't tell me it isn't pleasurable.
The corruption in our world? Well, actually, getting more prosperous as a society hasn't given us more real liberty, has it - it's only increased the appetites for more, more. Scripture says 'the horseleach has two daughters - give, and give' (Prov.30:15).
But it's not increased prosperity that has done it, actually, it's increased selfishness, because we, as a society, have cast off all the restraints that the true faith in God ever gave us. Now, society has become thoroughly secularised and 'humanised' and God has been 'airbrushed' out. So, we have had to work out our own morals - 'cherry-picking' a few from religion, and making up a few others more pleasing to us as well - called 'political correctness'. Man-pleasing morals, because we didn't like God's morals very much.
God has stood back and let us go our own way, just so we would see what fruit it brought. For he gave us free wills - and that means we are free to choose either good or evil and, just as God through his Holy Spirit pleads with us, the Evil One is also free to tempt us. Only if we stick close to God and learn from him will we be able to discern which is which.
That's it, in a nutshell. Well, it's the way I see it. Now, we are so far along the road towards total depravity and corruption that some folk are beginning to ask 'What's happened?' People who didn't realise before - when all was well - where the source of their happiness came from.
God has, as it were 'withdrawn his hand' of blessing and protection, because, if we didn't learn to know him under 'the good times'', maybe we will see a little better when - due to our own rebellion - he lets the 'bad things' come in. These are merely consequences of our own choices. We can't blame God for them, because he has never ceased to warn us, but we took no notice and went our own ways.
God puts it very well in Jeremiah, addressed to the wicked ways of the Jews at that time, but applicable also to us:
Jer 2:13 For my people have committed two evils; they have forsaken me the fountain of living waters, and hewed them out cisterns, broken cisterns, that can hold no water.