Well the answer to this lies in 2 camps. The main reason is that Therese May’s negotiations with the European Union are certainly not going well. In fact she is simply annoying our European Neighbours with her arrogance that she will win. Facts are that she really holds no persuasive bargaining power in these negotiations and the outcome will always be what it has been from the start that Britain faces a very tough and unprofitable Brexit. For May the further these negotiations go then the more likely that the outcome of these negotiations will not be positive for Britain or for her personally. Therefore before this happens and people of Britain begin to see behind the facade and start to blame the Conservatives for Britain’s Economic Demise, May simply wants to buy more time for herself and her Conservative Party in government by calling an early General Election in 2017. Quite simply by ruining the Economy whilst in Government would not look good for the Tories in the run up to another Election so she is hoping that within 5 years she can salvage something that could save her and her Party. Added to this is the fact that because of Brexit and the uncertainties regarding our Economy and the strength of the Pound she is further hampered by the Tories previous Election Pledges under Cameron not to raise taxation. Because of Brexit and to shore up the Economy she has calculated that this will be a further hindrance so she desperately needs to re-adjust this situation. When recently questioned about tax rises she was vague and non-committal. She well knows that she will be seeking to raise taxation. So in the end we will be all worse off well at least those that can least afford a tax rise namely the working classes. In this way Theresa May is being very devious and attempting to use the General Election in 2017 to increase taxation by stealth. This is to shore up her ineptness to steer us out of the European Union without bankrupting the country and ruining the Economy. She knows that there is a risk of this so she is seeking a mandate for us all to foot the bill for her and her Parties ineptitude.
Lastly May sees this as an opportunity to eliminate the threat from Jeremy Corbyn before he has really had a chance to develop his position in the Labour Party. Being a decent man with a caring attitude and high moral fibre she does see him as a threat despite what she has said in public. So she is spearheading a smear campaign against him with dirty political tactics. In fact she is rather despicable and not a very nice lady herself despite the public image that she attempting to cultivate ( a public makeover in the style of Margaret Thatcher). Corbyn is a good speaker and is a match for her and her arrogance in the House of Commons and May knows that he represents a threat. She is hoping that a General Election defeat will result in the Labour Party seeking to oust him as Leader in favour of another further plunging the Labour Party into turmoil.